Pipe jacking well plane connection measurement method and system

Abstract

The application is specifically a pipe jacking well plane connection measurement method and system, comprising the following steps: step S1, installing well edge fixing devices on the front side and the rear side of the well wall mouth of the working well and the receiving well, and installing a micro-RTK measuring instrument on the well edge fixing device, the phase center of the micro-RTK measuring instrument being capable of emitting a laser beam; step S2, burying a downhole forced homing device at the rear well wall in the well, and setting a rear-view well wall fixed forced homing device at the lower end of the front well wall, and aligning the centers of the two devices through the laser beam to realize reverse vertical point projection; step S3, installing a micro-RTK measuring instrument on a known reference point, and synchronously performing static GNSS observation with the micro-RTK measuring instruments on the working well and the receiving well, and directly obtaining the accurate coordinates of the working well and the receiving well through baseline solution and adjustment calculation. The application has the advantages of improving the accuracy of transferring the ground plane control point of the pipe jacking working well to the downhole control point and simplifying the preparation work.

Description

Technical Field

[0001] This invention relates to the field of plane connection measurement technology for pipe jacking wells, specifically a method and system for plane connection measurement of pipe jacking wells. Background Technology

[0002] In underground engineering projects such as pipe jacking, shield tunneling, and mine shafts, the plane coordinates of the surface control network must first be introduced underground as the starting point for jacking axis surveying and real-time correction. Traditional surface-to-underground plane connection surveying mainly employs the following three technical approaches: (1) Single-well orientation (single-well wire rope method): A fixed support is set up at the wellhead, and two thin steel wires with weights are suspended. The plane coordinates of the steel wires are determined by a ground total station. The horizontal angle and side length of the two steel wires are measured by a theodolite or total station in the well, and the coordinates of the control point in the well are calculated. This method is suitable for subway stations or mine shafts with shallow depth and large diameter. However, in pipe jacking working shafts (small diameter, large depth, and limited working space), the steel wires are easily affected by airflow, vibration and construction machinery, resulting in a long stabilization time. The support needs to be repeatedly disassembled and reassembled, which significantly prolongs the downtime of pipe jacking.

[0003] (2) Two-well orientation (double-well point-dropping method): Steel wires are suspended from two adjacent vertical shafts, and the coordinates of the steel wires are determined by ground traverse. Then, the traverse is connected and measured underground. This method requires two construction vertical shafts, and the ground traverse is complex to lay out. It is not suitable for single-well unidirectional jacking conditions.

[0004] (3) Triangular traverse "Z" shaped transfer: A total station is set up at the wellhead of the working well, and forced centering supports are arranged in multiple layers along the well wall to form a "Z" shaped branch traverse from top to bottom. This method is sensitive to the pitch angle. When the well depth exceeds a certain depth, the vertical angle is too large, which causes the horizontal circle to rotate with the vertical circle and generate systematic errors. The plane error at the weakest point in the well is difficult to meet the accuracy requirements of long-distance pipe jacking.

[0005] (4) Vertical alignment instrument (optical or laser vertical alignment instrument) projection method: A vertical alignment instrument is set up at the control point downhole, and a target is set up above ground. The plane coordinates are obtained by vertical projection. Although the vertical alignment instrument can ensure the projection accuracy, the target and support above ground need to be processed on site and repeatedly disassembled and assembled. If verification is required during the jacking process, the pipe jacking operation must be interrupted. The disassembly and assembly process is time-consuming, delays the construction period and increases the risk.

[0006] In summary, the existing technologies generally have the following shortcomings: The measurement process is cumbersome, requiring the laying of ground near-well points, the construction of traverse lines, and adjustment before conducting joint measurements. This involves numerous procedures and a large cumulative error. Custom-made fixing frames or pendulum supports are needed at both the wellhead and underground, which are time-consuming to assemble and disassemble, resulting in high labor and material costs. The accuracy of the points is greatly affected by environmental factors such as well depth, pitch angle, airflow, and mechanical vibration. Each verification requires work stoppage and waiting, resulting in long downtime for the pipe jacking machine, which directly affects construction safety and progress.

[0007] Therefore, there is an urgent need for a new planar connection measurement method suitable for pipe jacking working shafts, which can simultaneously complete the verification of the ground control network and the projection of underground control points in one go, while simplifying equipment and shortening downtime, so as to meet the needs of long-distance, high-precision pipe jacking construction. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and system for measuring the plane connection of jacking wells, so as to solve problems such as improving the accuracy of transferring the plane control points from the ground plane of the jacking well to the downhole control points and simplifying the related preparatory work.

[0009] To achieve the above objectives, a planar connection measurement method for pipe jacking wells is designed. This method includes the following steps: Step S1: Install wall-fixing forced centering devices on the front and rear sides of the upper openings of the working well and receiving well, respectively. Install a miniature RTK measuring instrument on each wall-fixing forced centering device. The phase center of the miniature RTK measuring instrument can emit a laser beam. Step S2: Independently bury a downhole forced centering device as a measurement station at the rear well wall. Set a rear-viewing wall-fixing forced centering device as a rear-viewing point at the lower end of the front well wall. Achieve reverse vertical point projection by aligning the laser beam with the centers of the downhole forced centering device and the rear-viewing wall-fixing forced centering device, respectively. Step S3: Install a miniature RTK measuring instrument at a known coordinate point and synchronously conduct static GNSS observations with the miniature RTK measuring instruments on the working and receiving wells. Through baseline calculation and adjustment calculation, directly obtain the precise coordinates of the working and receiving wells, achieving synchronous completion of surface connection verification and downhole transfer.

[0010] Preferably, the present invention further includes: step S1 further includes: step S1.1 installing a well wall fixing forced centering device at the edge of the working well, and fixing the miniature RTK measuring instrument with laser at the phase center on the device; step S1.2 adjusting the attitude of the miniature RTK measuring instrument so that its onboard laser beam is vertically downward.

[0011] Preferably, the present invention further includes: Step S2 further includes: Step S2.1 Installing a rear-view well wall fixing forced centering device above the starting hole and at the center of the jacking axis, and installing a downhole forced centering device on the independent base plate in front of the backrest at the bottom of the well, so that the center line connecting the two sets of centering devices coincides with the jacking axis; Step S2.2 Turning on the laser of the micro RTK measuring instrument and checking whether the laser beam passes through the center of the rear-view well wall fixing forced centering device and the downhole forced centering device at the same time; Step S2.3 If the centering is not precise, fine-tuning the well wall fixing forced centering device or the rear-view well wall fixing forced centering device until the laser beam is strictly vertical and passes through the two centers.

[0012] Preferably, the present invention further includes: Step S3 further includes: Step 3.1 Activating the static observation mode of all micro RTK measuring instruments and continuously collecting GNSS raw data for no less than 3 time periods; Step 3.2 Obtaining the ground coordinates of the phase center of the micro RTK measuring instrument through baseline calculation and adjustment, and converting the coordinates of the downhole control point of the downhole forced centering device using the centering element; Step 3.3 Comparing the calculated plane position of the downhole control point with the design center above ground; Step 3.4 If the plane position deviation is greater than the allowable value, repeating steps 2 to 3 until the deviation meets the accuracy requirements.

[0013] Preferably, the present invention further includes: the static GNSS observation includes two time periods, each lasting one hour, and constrained adjustment is performed using known coordinate points.

[0014] Preferably, the present invention further includes: in the method, the laser beam of the miniature RTK measuring instrument is reversed and vertically projected to eliminate the horizontal circle error caused by excessive pitch angle during the transmission of the triangular traverse.

[0015] This invention also provides a planar connection measurement system for pipe jacking wells. The system, using the method described above, includes: a working well located at the starting point of the pipe jacking section, where the pipe jacking machine and the first pipe section begin jacking; a receiving well located at the ending point of the pipe jacking section, used to receive the pipe jacking machine (or the first pipe section) exiting the tunnel; a miniature RTK measuring instrument whose phase center can emit a laser beam; a well wall fixing forced centering device for fixing the miniature RTK measuring instrument to the well walls of the working well and the receiving well; and a downhole forced centering device located at the bottom of the working well and the receiving well for receiving the laser beam and... Precise positioning of downhole control points; a backsight wellbore fixed forced centering device, set at the lower end of the front wellbore of the working well, is used to receive the laser beam and achieve precise positioning of downhole control points; a first known coordinate point and a third known coordinate point are set on the ground on the sides of the wellheads of the working well and the receiving well, and a second known coordinate point is set on the ground between the working well and the receiving well, used for synchronous static GNSS observation with the miniature RTK measuring instrument; the first known coordinate point and the third known coordinate point are used for constraint control and as starting points; the second known coordinate point is used to verify the correctness of the calculated coordinates.

[0016] Preferably, the present invention further includes: the micro RTK measuring instrument uses a laser beam to project a point vertically in the opposite direction to the downhole forced centering device, thereby achieving high-precision positioning of the downhole control point; the line connecting the geometric centers of the working well and the receiving well is the jacking axis, used to reflect the direction of the pipe-laying machine's movement during construction.

[0017] Preferably, the present invention further includes: the system simultaneously performing ground-to-ground verification and downhole transfer.

[0018] Preferably, the present invention further includes: the downhole forced centering device is a forced centering platform made of I-beams or channel steel, the center of which is located on the jacking axis and 250 cm from the rear backrest.

[0019] Compared with the prior art, the advantages of this invention are: (1) Significantly improve the accuracy of downhole plane points: Traditional triangulation transfer results in insufficient downhole point accuracy due to errors caused by the large pitch angle and the rotation of the horizontal circle with the vertical circle. This invention uses miniature RTK static measurement (accuracy 5mm+1ppm) + vertical laser beam projection to eliminate instrument rotation errors and avoid angle transfer deviations. The accuracy of downhole points is directly guaranteed by high-precision RTK and vertical laser positioning.

[0020] (2) Significantly reduces pipe jacking downtime: Traditional methods (vertical instrument / plumb bob method) require repeated disassembly and assembly of the well target / fixed frame, and each verification requires work stoppage and waiting, resulting in excessive downtime for pipe jacking and construction risks. This invention permanently fixes the miniature RTK to the well wall (small in size and light in weight), eliminating the disassembly and assembly process. During measurement, only the equipment needs to be turned on, achieving "instant measurement", and the downtime is close to zero.

[0021] (3) Simplify the measurement process and achieve “one-time forming”: Traditional methods require step-by-step operation: laying ground near well points, conducting traverse surveys to generate adjustment, forming a connection for measurement transfer, which is cumbersome and accumulates errors.

[0022] This invention uses RTK on the surface to directly connect to the ground reference point and then to the downhole centering device via a laser beam in reverse. The ground connection verification and downhole point projection are completed simultaneously, skipping intermediate steps, reducing error sources, and improving efficiency by more than 50% (refer to the complexity of GNSS wire rope suspension in the alternative solution).

[0023] (4) Reduce the impact of environmental interference: The weighted method relies on the stability of the steel wire, and it needs to remain still for a long time when affected by wind and vibration, which limits the measurement window. The present invention adopts instantaneous laser beam projection + RTK static observation, which has no mechanical sway problem, strong wind and earthquake resistance, and adapts to complex construction environments.

[0024] (5) Reduced construction costs and operational difficulty: Traditional fixing frames / targets require custom processing, and the manufacturing and disassembly are time-consuming and labor-intensive, resulting in high labor and material costs. This invention adopts a standardized well wall fixing device (pre-embedded I-beams / channel steel), and the micro RTK is plug-and-play, easy to install and reusable, reducing the overall cost by more than 30% (compared to the manufacturing and maintenance costs of traditional steel frames). Attached Figure Description

[0025] Figure 1 1 is a front sectional view of the system of the present invention; Figure 2 This is a top view of the system of the present invention; Figure 3 This is a flowchart of the method of the present invention; In the diagram: 1 Working shaft, 2 Receiving shaft, 3 Shaft wall fixed forced centering device, 4 Downhole forced centering device, 5 Miniature RTK measuring instrument, 6 Back-viewing shaft wall fixed forced centering device, 7-1 First known coordinate point, 7-2 Second known coordinate point, 7-3 Third known coordinate point, 8 Jacking axis, 9 Laser beam. Detailed Implementation

[0026] To make the purpose, principle and structure of the present invention clearer, the following description is provided in conjunction with the accompanying drawings and specific embodiments.

[0027] This invention provides a method and system for measuring the planar connection of a jacking well.

[0028] First, it's worth clarifying that GNSS (Global Navigation Satellite System) and RTK (Real-Time Kinematic) are real-time dynamic differential positioning methods, a high-precision measurement technique based on GNSS. By setting up base stations at known points and sending differential correction data to a rover in real time, it improves GNSS positioning accuracy from meters to centimeters or even millimeters. An RTK measuring instrument is a comprehensive measuring instrument that uses this method.

[0029] Working shaft 1 and receiving shaft 2 were excavated and constructed according to the design drawings. Working shaft 1 is located at the starting point of the pipe jacking section, and its inner wall is built with a backrest, the center of which coincides with the jacking axis 8. Receiving shaft 2 is located at the end point of the pipe jacking section, with a reserved opening at the bottom for the pipe jacking machine to exit. The elevation of the two shaft openings is the same, and the elevation of the shaft bottom is controlled according to the design slope difference to ensure the continuous connection of the jacking axis 8.

[0030] At the top opening of the working well 1 and receiving well 2, a wall-fixing forced centering device 3 is welded or pre-embedded on the front and rear sides of the top opening along the jacking axis 8. This device is made of bent steel plate of a certain thickness and is equipped with a locking mechanism to support the miniature RTK measuring instrument 5 and allow for fine-tuning of its attitude. After installation, it is calibrated with a spirit level to ensure the horizontality of the mounting surface.

[0031] A forced centering device 3 for fixing the well wall is welded to the center of the outer side of the well wall above the starting tunnel. A vertical through hole is opened in the middle of the forced centering device 3, and the center of the forced centering device coincides with the jacking axis 8.

[0032] An independent concrete platform is constructed approximately 250 cm in front of the backrest at the bottom of the well. A forced centering device 4 is pre-embedded on the top surface of the platform, serving as a surveying station. This device is made of a section of I-beam or channel steel, with a vertical through-hole machined at the center of its upper surface. The line connecting the center of this hole and the center of the forced centering device on the well wall coincides with the jacking axis 8. The line connecting the two holes forms the laser projection path, ensuring projection accuracy.

[0033] At the lower end of the front well wall, a rear-view well wall fixing forced centering device 6 is welded and used as a rear-view point. A vertical through hole is also machined at the center of the upper surface of the rear-view well wall fixing forced centering device 6, and the center of the hole coincides with the center of the well wall fixing forced centering device 3 at the wellhead.

[0034] The miniature RTK measuring instrument 5 with a laser at the phase center is installed on the wellbore fixed forced centering device 3, and then powered on to enter attitude adjustment mode. The onboard laser beam 9 is vertically downwards by adjusting the leveling bolts until the laser point simultaneously passes through the center holes of both the wellbore forced centering device and the downhole forced centering device 4, completing the coarse adjustment. If deviation occurs, the wellbore fixed forced centering device 3 or the centering device is finely adjusted until the laser beam 9 passes through both center holes without obstruction, achieving strict verticality.

[0035] At least three known coordinate points 7 are established in a stable ground area. The first known coordinate point 7-1 and the second known coordinate point 7-3 are located near the two wells, and the second known coordinate point 7-2 is located anywhere between the two wells. Multiple miniature RTK measuring instruments 5 are set up at each known coordinate point 7 and simultaneously powered on with the miniature RTK measuring instrument 5 mounted on the well wall-fixed forced centering device 3, entering static GNSS observation mode. Raw data is continuously collected for at least two time periods, each lasting 60 minutes. After the observation is completed, the data is imported into post-processing software for baseline calculation. Adjustment is performed using the first known coordinate point 7-1 and the second known coordinate point 7-3 as constraint points, and the second known coordinate point 7-2 as a check point. The adjustment yields the coordinates of all stations.

[0036] The phase center coordinates of the miniature RTK measuring instrument 5 on the wellbore fixed forced centering device 3 are extracted using post-processing software. Combined with the geometric parameters of the wellbore and the downhole forced centering device 4 (relative position of the borehole center, elevation difference, azimuth angle), the centering elements are calculated, and the phase center coordinates are normalized to the center of the downhole forced centering device 4 to obtain the final plane coordinates of the downhole control point. Similarly, the plane coordinates of the backsight wellbore fixed forced centering device 6 are obtained. These coordinates are compared with the designed center coordinates on the wellbore. If the plane position deviation exceeds the designed error range, the above steps are repeated until the accuracy requirements are met.

[0037] After accuracy confirmation, the wellbore fixing forced centering device 3 and all centering devices are locked to prevent disturbance during subsequent construction. Using the center of the downhole forced centering device 4 as the measuring station and the backsight point of the forced centering device 6 at the lower end of the front wellbore as the backsight point, the downhole construction control network is set up, the jacking axis 8 and the correction measurement benchmark are established, and all results and data are delivered to the construction unit.

[0038] By directly aligning the miniature RTK laser beam 9 with the downhole forced centering device 4 and the rear-view forced centering device 6 at the lower end of the front well wall, a high-precision "one-time forming" transmission is achieved. This eliminates the need for traditional wire segmented transmission or repeated disassembly and assembly of targets, significantly shortening the pipe jacking downtime, reducing construction costs, and improving operational safety and measurement reliability.

[0039] It is worth noting that this invention achieves reverse vertical point projection, and its core principle is to reverse the process of "lowering" the measurement benchmark from the ground to the well.

[0040] Traditionally, the laser beam is projected upwards from the wellhead. This invention utilizes a laser beam 9 emitted from the phase center of a miniature RTK measuring instrument 5 to project a vertical beam directly from the wellhead to the bottom. Specifically, the miniature RTK measuring instrument 5 is fixed to a well-wall fixed forced centering device 3 on the outer side of the well wall. Its phase center laser emits a visible beam downwards. After passing through the central hole of the well-wall fixed forced centering device 3, the beam continues vertically to the bottom of the well, coinciding with the central holes of the downhole forced centering device 4 and the rear-view well-wall fixed forced centering device 6 at the lower end of the front well wall. This creates a laser target point at the bottom of the well that strictly corresponds to the ground reference coordinate system. Because the laser direction is naturally vertical, no angle conversion is required, avoiding horizontal circle errors caused by pitch angles. Simultaneously, the laser is instantaneously stable and unaffected by external disturbances such as wind vibration or hammer oscillation. Therefore, this reverse vertical projection not only achieves high-precision transmission in a single step but also compresses the traditionally long stabilization waiting time, truly achieving "instant measurement."

[0041] Example 1: 1. Initially determine the starting axis of the working well 1 and extend it to the well wall. Then, make points on the upper opening of the well wall at the back and starting hole. Extend the reserved hole of the receiving well to the upper opening of the well wall and make points.

[0042] 2. Based on the initial axis point of the upper opening of the well wall obtained from the survey, install the working well 1, the receiving well 2, and the well wall fixed forced centering device 3.

[0043] 3. Install a miniature RTK measuring instrument 5 on the front and rear well wall fixing device respectively, turn on the instrument and turn on the laser. According to the laser beam 9, install the downhole forced centering device 4 at the backrest and the rear-viewing forced centering device 6 at the lower end of the front well wall respectively. After fine adjustment, fix the laser beam 9 to coincide with the center of the downhole forced centering device 4 and the rear-viewing point of the front well wall 6.

[0044] 4. Install miniature RTK measuring instruments 5 at the first known coordinate point 7-1, the second known coordinate point 7-2, and the third known coordinate point 7-3 respectively. At the same time, fix the well wall fixing forced centering device 3 on the well wall on the front and rear sides of the working well 1 and fix the well wall fixing forced centering device 3 on the well wall of the receiving well 2 and install the miniature RTK measuring instruments 5.

[0045] 5. Start the system and conduct two synchronous static GNSS observations, each lasting one hour. After the baseline calculation is successful, use the first known coordinate point 7-1 and the third known coordinate point 7-3 as constraint points for adjustment, and the second known coordinate point 7-2 as the check point. The adjustment yields the coordinates of the working shaft and the receiving shaft, thus obtaining the actual jacking axis and the control coordinates for jacking correction in the working shaft 1.

[0046] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the invention, based on the technical solution and concept of the invention, should be covered within the scope of protection of the invention.

Claims

1. A method for measuring the planar connection of a jacking well, characterized in that, The method includes the following steps: Step S1 Install well wall fixing forced centering device (3) on the front and rear sides of the well wall opening of the working well (1) and the receiving well (2) respectively, and install a miniature RTK measuring instrument (5) on the well wall fixing forced centering device (3). The phase center of the miniature RTK measuring instrument (5) can emit a laser beam. Step S2: An underground forced centering device (4) is independently installed at the rear well wall as a measurement station, and a rear-viewing well wall fixed forced centering device (6) is set at the lower end of the front well wall as a rear-viewing point. The laser beam is aligned with the center of the underground forced centering device (4) and the rear-viewing well wall fixed forced centering device (6) respectively to achieve reverse vertical projection. Step S3: Install a miniature RTK measuring instrument (5) on the known coordinate point (7) and conduct static GNSS observation synchronously with the miniature RTK measuring instrument (5) on the working well (1) and the receiving well (2). Through baseline calculation and adjustment calculation, the accurate coordinates of the working well (1) and the receiving well (2) are directly obtained, realizing the synchronous completion of ground connection verification and underground transmission.

2. The method for measuring the planar connection of a jacking well as described in claim 1, characterized in that, Step S1 further includes: Step S1.1 Install a wall-fixing forced centering device (3) at the edge of the working well (1) and fix a miniature RTK measuring instrument (5) with a laser at the phase center on the device; Step S1.2 Adjust the attitude of the miniature RTK measuring instrument (5) so that its onboard laser beam is vertically downward.

3. The method for measuring the planar connection of a jacking well as described in claim 1, characterized in that, Step S2 also includes: Step S2.1 Install a rear-view well wall fixing forced centering device (6) above the starting hole and at the center of the jacking axis (8), and install a downhole forced centering device (4) on the independent bottom plate behind the backrest at the bottom of the well, so that the center line connecting the two sets of centering devices coincides with the jacking axis (8); Step S2.2 Turn on the laser of the micro RTK measuring instrument (5) and check whether the laser beam passes through the center of the back-view well wall fixed forced centering device (6) and the downhole forced centering device (4) at the same time; If the alignment is not precise in step S2.3, fine-tune the wellbore fixing forced centering device (3) or the back-view wellbore fixing forced centering device (6) or the downhole forced centering device (4) until the laser beam is strictly vertical and penetrates both centers.

4. The method for measuring the planar connection of a jacking well as described in claim 1, characterized in that, Step S3 also includes: Step 3.1 Start the static observation mode of all miniature RTK measuring instruments (5) and continuously collect GNSS raw data for no less than 2 time periods; Step 3.2 By baseline calculation and adjustment, the ground coordinates of the phase center of the micro RTK measuring instrument (5) are obtained, and the coordinates of the downhole control point of the downhole forced centering device (4) are calculated using the centering element; Step 3.3 Compare the calculated downhole control point planar positions with the surface design centers; Step 3.4 If the planar position deviation is greater than the allowable value, repeat steps 2 to 3 until the deviation meets the accuracy requirements.

5. The method for measuring the planar connection of a jacking well as described in claim 1, characterized in that, The static GNSS observations consist of two time periods, each lasting one hour, and are constrained by known coordinate points (7).

6. The method for measuring the planar connection of a jacking well as described in claim 1, characterized in that, In the method, the laser beam of the micro RTK measuring instrument (5) is reversed and vertically projected to eliminate the horizontal circle error caused by excessive pitch angle in the transmission of the triangular traverse.

7. A planar connection measurement system for pipe jacking wells, characterized in that, The system uses the method as described in any one of claims 1-6, and the system comprises: The working shaft (1) is located at the beginning of the pipe jacking section, which is the position where the pipe jacking machine and the first pipe section begin to jack; The receiving well (2) is located at the end of the pipe jacking section and is used to receive the pipe jacking machine (or the first pipe section) exiting the tunnel; The miniature RTK measuring instrument (5) has a phase center capable of emitting a laser beam; The well wall fixing forced centering device (3) is used to fix the micro RTK measuring instrument (5) to the well wall of the working well (1) and the receiving well (2); The downhole forced centering device (4) is installed at the bottom of the working well (1) and the receiving well (2) to receive the laser beam and achieve precise positioning of the downhole control point; The rear-view well wall fixing forced centering device (6) is set at the lower end of the front well wall of the working well (1) and is used to align with the laser beam to verify the measurement accuracy; The first known coordinate point (7-1) and the third known coordinate point (7-3) are set on the ground on the side of the wellhead of the working well (1) and the receiving well (2). The second known coordinate point (7-2) is set on the ground between the working well (1) and the receiving well (2) for synchronous static GNSS observation with the micro RTK measuring instrument (5). The first known coordinate point (7-1) and the third known coordinate point (7-3) are used for constraint control and as the starting point. The second known coordinate point (7-2) is used to verify the correctness of the calculated coordinates.

8. The jacking well planar connection measurement system as described in claim 7, characterized in that, The miniature RTK measuring instrument (5) uses a laser beam to vertically project points to the downhole forced centering device (4) to achieve high-precision positioning of downhole control points; The line connecting the geometric centers of the working well (1) and the receiving well (2) is the jacking axis (8), which is used to reflect the direction of the pipe machine's movement during construction.

9. A jacking well planar connection measurement system as described in claim 7, characterized in that, The system performs simultaneous ground-based interconnection verification and downhole transfer.

10. A jacking well planar connection measurement system as described in claim 7, characterized in that, The downhole forced centering device (4) is a forced centering platform made of I-beams or channel steel, with its center located on the jacking axis (8) and 250 cm from the backrest.

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