An automatic elevation monitoring system and a method for real-time measurement and control of the bottom formwork elevation.

Abstract

This invention discloses an automatic elevation monitoring system and a real-time elevation measurement and control method for the bottom formwork. The system includes a real-time dynamic differential measurement device, a laser rangefinder, a cloud computing platform, and a jack servo controller. The real-time dynamic differential measurement device and the laser rangefinder perform real-time multi-point measurements of the absolute and relative elevations of the bottom formwork control points, respectively. The cloud computing platform receives, stores, and analyzes the measured elevation data in the cloud, automatically calculates the required elevation adjustment value for each jack, and sends it to the jack servo controller. The jack servo controller then uniformly controls the raising and lowering of all jacks based on the calculated elevation adjustment value, achieving rapid and accurate adjustment of the bottom formwork elevation. This invention improves the accuracy and efficiency of elevation adjustment, automates measurement, reduces labor costs, and lowers construction risks.

Description

Technical Field

[0001] This invention relates to the fields of building industrial automation and smart construction sites, and in particular to an automatic elevation monitoring system and a method for real-time measurement and control of the bottom formwork elevation. Background Technology

[0002] The main girder construction of continuous rigid frame bridges and continuous beam bridges typically employs the symmetrical cantilever casting method using a diamond-shaped hanging basket, proceeding in segments. The main girder formwork needs to be adjusted to the correct position before the construction of each segment, with the elevation control of the bottom formwork (referred to as "bottom formwork") being the most crucial. Excessive formwork positioning errors can have many adverse effects, ranging from poor bridge appearance to altering the bridge's internal force distribution and reducing structural durability.

[0003] The work sequence for adjusting the bottom formwork elevation is as follows: First, after the formwork is moved into place, the elevation of the coordinate control points of the bottom formwork is measured using a total station and level. Then, the bottom formwork is adjusted based on the difference between the target elevation and the measured elevation. This process is repeated, measuring and adjusting again, until the measured elevation of the bottom formwork reaches the allowable deviation range of the target elevation. In traditional bottom formwork elevation adjustment, both measurement and adjustment are done manually. Manual measurement cannot provide real-time monitoring and timely feedback; since adjustment and measurement are not simultaneous, the adjustment work relies on intuition. Furthermore, due to the interconnected positions of the control points and the non-elastic deformation of the formwork and bottom formwork, it is difficult to effectively accumulate experience during adjustment, often requiring repeated adjustments and measurements to achieve the target elevation. In addition, the elevation of the bottom formwork may not be stable after adjustment; during construction, unexpected changes in elevation may occur over time, requiring timely detection and readjustment. In short, bottom formwork elevation adjustment is a time-consuming and labor-intensive task. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an automatic elevation monitoring system and a real-time elevation measurement and control method for the bottom formwork. By combining real-time dynamic (RTK) differential measurement equipment and laser ranging sensors, it can promptly detect the misalignment of the main beam bottom formwork and quickly and accurately adjust the bottom formwork to the target elevation. It is highly efficient, has a fast response speed, and can perform multi-point measurement and control.

[0005] An automatic elevation monitoring system includes a real-time dynamic differential measurement device, a laser rangefinder, a cloud computing platform, and a jack servo controller;

[0006] The real-time dynamic differential measurement equipment includes a base station and a rover station. The base station is a signal receiving station fixed at a ground standard surveying control point, used to receive satellite data and transmit it to the rover station in real time. The rover station, i.e., the measurement terminal, is set at the bottom formwork control point. While receiving satellite signals, it also receives geographic information data transmitted by the base station and calculates the absolute elevation of the bottom formwork control point for real-time monitoring of the bottom formwork elevation. The bottom formwork control point is set on the bottom formwork of the main beam, located on the perpendicular line between each front sling support point and the front edge of the constructed main beam, at the end formwork position of the segment to be constructed. The absolute elevation is the height of the bottom formwork control point relative to the national standard elevation reference line.

[0007] The laser ranging sensor is installed on the moving crossbeam of the rhomboid truss, and corresponds one-to-one with each bottom formwork control point in the vertical direction. The laser is used to measure the relative elevation of each bottom formwork control point by shining the laser vertically downward. The relative elevation is the vertical distance of the bottom formwork control point relative to the moving crossbeam on the rhomboid truss, and is taken as a positive value, which is used to adjust the bottom formwork to the target elevation.

[0008] The cloud computing platform receives and saves the absolute elevation of the bottom mold control point measured by the mobile station and the relative elevation of the bottom mold control point measured by the laser ranging sensor in the cloud, automatically calculates the required elevation adjustment value for each jack, and sends it to the jack servo controller.

[0009] The jack servo controller controls the lifting and lowering of all jacks in a unified manner based on the elevation adjustment value calculated by the cloud computing platform, thereby achieving rapid and accurate adjustment of the bottom formwork elevation.

[0010] Furthermore, the real-time dynamic differential measurement device, laser rangefinder, and jack servo controller are covered by a unified wireless local area network. The relative elevation and relative elevation data of the bottom mold control point are transmitted wirelessly to the cloud computing platform. The jack servo controller receives all elevation adjustment values ​​sent by the cloud computing platform wirelessly.

[0011] Furthermore, there are four reference stations, arranged in pairs. The two reference stations in a pair are arranged on both sides of the mileage position of the bridge pier, and the line connecting each pair of reference stations is perpendicular to the center line of the bridge.

[0012] Furthermore, the mobile station and the bottom mold control point are in one-to-one correspondence, and the number of bottom mold control points is 3 to 6.

[0013] A method for real-time elevation measurement and control of the bottom formwork based on an automatic elevation monitoring system includes the following steps:

[0014] S1: The absolute elevation H of n bottom formwork control points is measured by a real-time dynamic differential measurement device. iThe data, i = 1, 2, ..., n, are uploaded to the cloud computing platform. The cloud computing platform will then determine the absolute elevation based on the absolute elevation: if there exists an absolute elevation H at any point... i The difference ΔH between the target elevation H and the target elevation H i =H i If -H exceeds the set threshold, proceed to step S2; otherwise, continue monitoring the absolute elevation of each bottom mold control point.

[0015] S2: Activate the laser rangefinder sensor to measure the relative elevation h of n bottom mold control points. i The data is then uploaded to the cloud computing platform, which first calculates the target relative elevation h = h_0 for each bottom model control point. i +ΔH i ;

[0016] S3: n laser rangefinders measure the real-time relative elevation of each bottom mold control point at a preset frequency, and obtain the updated relative elevation h of the bottom mold control points. i ;

[0017] S4: The cloud computing platform recalculates the real-time relative elevation h of the n bottom mold control points. i The difference Δh between its corresponding target relative elevation h i =h i -h, and determine the mean difference. and the phase difference Δh between the maximum and minimum differences max -Δh min Is it within the set threshold range? If yes, proceed to step S7; otherwise, proceed to step S5.

[0018] S5: Calculate the required elevation adjustment T for n jacks. i The calculation formula is:

[0019] T i =-Δh i *D / d+Rp

[0020] Rp=(Δh max -Δh min ) / n

[0021] In the formula, D represents the distance from the n front sling support points to the leading edge of the constructed main beam, d represents the distance from the end formwork position of the segment to be constructed to the leading edge of the constructed main beam, and Rp is the nonlinear correction term of the structure; T i A positive result indicates that the jack needs to be raised, while a negative result indicates that the jack needs to be lowered.

[0022] S6: n servo controllers uniformly control the lifting and lowering of all jacks according to the corresponding elevation adjustment values;

[0023] S7: Turn off the laser rangefinder and restart the real-time dynamic differential measurement equipment to continue monitoring the absolute elevation of the n bottom mold control points.

[0024] Furthermore, in step S3, the measurement frequency of the laser rangefinder is determined according to the speed of the jack's extension and retraction, ensuring that the jack's stroke does not exceed 5mm within the time interval between two measurements.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The automatic elevation monitoring system of the present invention utilizes a combination of RTK differential measurement equipment and laser rangefinder sensor to measure the elevation of the base formwork. On the one hand, it can replace traditional leveling instruments or total stations, reducing manual labor and minimizing the introduction of human error during the measurement process, thereby improving measurement accuracy. On the other hand, the laser rangefinder sensor enables rapid and high-precision measurement of multi-point elevations, compensating for the slow measurement time and insufficient accuracy inherent in RTK differential measurement equipment, thus greatly improving the quality and efficiency of elevation adjustment.

[0027] 2. Replacing manual adjustment with a jack servo controller not only further reduces labor costs and construction risks, but also ensures higher adjustment speed and accuracy.

[0028] 3. All detected elevation data will be transmitted and saved to the cloud in real time, which will help with subsequent phase review and engineering quality inspection, trace the construction process, and will also be applied to the operation and maintenance of the bridge. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the plan layout of the RTK reference stations in the automatic elevation monitoring system of this invention (taking the construction of a three-span continuous beam bridge as an example), where 1-continuous beam bridge under construction, 101-main beam completed, 102-cantilever cast-in-place section to be constructed, 103-bridge centerline, 104-mileage position of bridge pier, 201-RTK measurement reference station one, 202-RTK measurement reference station two, 203-RTK measurement reference station three, and 204-RTK measurement reference station four.

[0030] Figure 2 This is a schematic diagram of the planar arrangement of the bottom formwork control points of the present invention, wherein 105-the front line of the constructed main beam, 106-the end formwork position of the segment to be constructed, 4-the lower crossbeam in front of the hanging basket, 401-front sling support point one, 402-front sling support point two, 403-front sling support point three, 404-front sling support point four, K1, K2, K3, K4-bottom formwork control points.

[0031] Figure 3This is a schematic diagram of the absolute elevation measurement method of the present invention, wherein 301-main beam flange, 302-main beam bottom formwork, 303-main beam side formwork, 501-RTK measurement mobile station one, 502-RTK measurement mobile station two, 503-RTK measurement mobile station three, and 504-RTK measurement mobile station four.

[0032] Figure 4 This is a schematic diagram of the relative elevation measurement method of the present invention, wherein 6-moving crossbeam, 7-laser ranging sensor, 8-front upper crossbeam, 9-jack servo controller, h1-relative elevation at control point K1, d-distance from the end formwork position of the segment to be constructed to the leading edge line of the constructed main beam, and D-distance from the front sling support point to the leading edge line of the constructed main beam.

[0033] Figure 5 This is a specific schematic diagram of multiple elevation concepts in this invention, where 10 is the national standard elevation reference line, 11 is the target elevation reference line, H is the target elevation, h is the target relative elevation, H1, h1, and ΔH1 are the absolute elevation, relative elevation, and elevation difference at control point K1, and the rest are similar.

[0034] Figure 6 This is a schematic diagram of the working principle of the automatic elevation monitoring system of the present invention, wherein 12-cloud computing platform.

[0035] Figure 7 This is a flowchart of the real-time elevation measurement and control method for the bottom formwork based on an automatic elevation monitoring system, according to the present invention. Detailed Implementation

[0036] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0037] See Figure 1 This diagram illustrates the planar layout of the base stations in the RTK measurement phase of this embodiment. Number 1 represents a continuous beam bridge under construction, number 101 represents a completed main beam, and number 102 represents a cantilevered cast-in-place section to be constructed. This embodiment will use this typical three-span continuous beam bridge as an example; other engineering embodiments only require reasonable adjustments and expansions based on this embodiment. In this embodiment, four RTK measurement base stations are set up, including base station 1 (201), base station 2 (202), base station 3 (203), and base station 4 (204), forming an RTK network. The layout of the four base stations 201, 202, 203, and 204 is mainly determined by the mileage position 104 of the bridge pier. Preferably, the four base stations 201, 202, 203, and 204 are arranged in pairs, such as... Figure 1As shown, reference stations 201 and 203 form one pair, and reference stations 202 and 204 form another pair. The pairs of reference stations are arranged on either side of mileage position 104 on the bridge pier. The line connecting each pair of reference stations is perpendicular to the bridge centerline 103. That is, the lines connecting reference stations 201 and 203, and 202 and 204, are both perpendicular to the bridge centerline 103. The distances between the pairs of reference stations 201 and 203, and 202 and 204, can be set to the length of the mid-span of the continuous beam bridge 1. If the above-mentioned preferred layout method cannot be implemented in the actual environment (e.g., encountering rivers, rugged terrain, etc.), the locations of the reference stations can be appropriately moved towards the main body of the bridge or both banks of the bridge, ensuring that the straight-line distance between any two reference stations does not exceed 2.5 km. Figure 1 The diagram only shows the layout of 4 base stations; the number of base stations can be adjusted according to the actual situation.

[0038] See Figure 2 The figure illustrates the planar layout of the bottom formwork control points in this embodiment. Numbers 401, 404, 403, and 404 represent the four front lifting supports on the lower crossbeam 4 of the hanging basket. In this embodiment, four bottom formwork control points are arranged on the main beam bottom formwork 302: control point one K1, control point two K2, control point three K3, and control point four K4. These are located perpendicular to the front lifting support points 401, 402, 403, and 404 and the front edge line 105 of the constructed main beam, respectively, at the end formwork position 106 of the cantilever cast-in-place section 102 to be constructed. Generally, the number of bottom formwork control points can be set to 3 to 6.

[0039] See Figure 3 This figure illustrates the method for measuring the absolute elevation of the bottom formwork of the hanging basket in this embodiment. In this embodiment, 301 is the flange of the main beam, 302 is the bottom formwork of the main beam, and 303 is the side formwork of the main beam. The absolute elevations of bottom formwork control points K1, K2, K3, and K4 are obtained by RTK mobile stations 501, 502, 503, and 504, respectively, which are erected at each control point. In this embodiment, the instrument height of the RTK mobile stations is set to 1m.

[0040] In this embodiment, the four base stations and the rover station use the Hi-Target V300 stakeout king, and the RTK elevation measurement accuracy is ±15mm.

[0041] See Figure 4This figure illustrates the method for measuring the relative elevation of the bottom formwork of the hanging basket in this embodiment. In this embodiment, taking bottom formwork control point K1 as an example, the relative elevation h1 of bottom formwork control point K1 is set as its vertical distance relative to the moving crossbeam 6 on the rhomboid truss, and is taken as a positive value. The relative elevation data is obtained by illuminating bottom formwork control point K1 with laser ranging sensors 7 using a laser ranging method. Four laser ranging sensors 7 are deployed on the moving crossbeam 6 of the rhomboid truss. The horizontal position of the moving crossbeam 6 is adjusted so that the sensors correspond one-to-one with each bottom formwork control point in the vertical direction. Before starting the measurement, the laser ranging sensors must be vertically calibrated to ensure that the path illuminated by the laser ranging sensors does not produce vertical deviation. The figure also shows jack servo controllers 9, which are fixed on the upper front crossbeam 8. There are also four jack servo controllers 9, which control the movement of the lower front crossbeam 4 of the hanging basket. The distance from the end formwork position 106 of the segment to be constructed to the leading edge line 105 of the constructed main beam is d. In this embodiment, the distance d can be set to 4m. The distance from the front sling support point to the leading edge line of the constructed main beam is D.

[0042] The laser rangefinder 7 in this embodiment is the Dimas DPE-10-500 industrial laser rangefinder, with a measurement accuracy of ±0.5mm and a maximum measurement frequency of 250Hz.

[0043] See Figure 5 This figure further illustrates the absolute and relative elevations of the bottom formwork described in this embodiment. As shown in the figure, the heights H1, H2, H3, and H4 of the four bottom formwork control points K1, K2, K3, and K4 on the main beam bottom formwork 302 relative to the national standard elevation reference line 10 are the absolute elevations. The vertical distances h1, h2, h3, and h4 of the four bottom formwork control points K1, K2, K3, and K4 relative to the moving crossbeam 6 are the relative elevations. Before adjusting the formwork elevation, the construction monitoring unit will provide the target elevation H of the main beam bottom formwork 302. The main purpose of adjusting the formwork elevation is to match the elevations of each control point of the bottom formwork 302 with the target elevation reference line 11. At this point, since the elevation of the main beam bottom formwork 302 has not yet matched the target elevation reference line 11, an elevation difference ΔH1, ΔH2, ΔH3, and ΔH4 are formed at each control point (positive if the main beam bottom formwork 302 is higher than the target elevation reference line 11, negative otherwise). Adding the elevation differences ΔH1, ΔH2, ΔH3, and ΔH4 to the relative elevations at each control point gives the target relative elevation h for each control point. It should be noted that in practice, the moving crossbeam 6 is not necessarily horizontal; therefore, the target relative elevations at each control point may not be the same, requiring individual processing for each control point.

[0044] In this embodiment, for the convenience of data transmission, such as Figure 6As shown, further optimizations are made to embodiments 4, 6, and 8 above. To better realize the present invention, the four RTK measurement base stations 201, 202, 203, and 204, the four RTK measurement mobile stations 501, 502, 503, and 504, the four laser rangefinders 7, and the four jack servo controllers 9 are all covered by a unified wireless local area network at the construction site. All collected elevation data will be wirelessly transmitted to the cloud computing platform 12, and all elevation adjustment values ​​will also be wirelessly sent to the corresponding jack servo controllers 9.

[0045] See Figure 7 The figure illustrates a method for real-time measurement and control of the bottom formwork elevation based on an automatic elevation monitoring system, including the following steps:

[0046] S1: The absolute elevation H of n bottom formwork control points is measured by a real-time dynamic differential measurement device. i The data, i = 1, 2, ..., n, are uploaded to the cloud computing platform. The cloud computing platform will then determine the absolute elevation based on the absolute elevation: if there exists an absolute elevation H at any point... i The difference ΔH between the target elevation H and the target elevation H i =H i If -H exceeds the set threshold, proceed to step S2; otherwise, continue monitoring the absolute elevation of each bottom mold control point.

[0047] S2: Activate the laser rangefinder sensor to measure the relative elevation h of n bottom mold control points. i The data is then uploaded to a cloud computing platform, which first calculates the target relative elevation h = h at each base control point. i +ΔH i ;

[0048] S3: n laser rangefinders measure the real-time relative elevation of each bottom mold control point at a preset frequency, and obtain the updated relative elevation h of the bottom mold control points. i The measurement frequency of the laser rangefinder 7 is determined by the extension and retraction speed of the jack, ensuring that the jack's stroke does not exceed 5mm within the time interval between two measurements to guarantee accuracy. In this embodiment, the preset frequency is five times per second.

[0049] S4: The cloud computing platform recalculates the real-time relative elevation h of each bottom mold control point. i The difference Δh between its corresponding target relative elevation h i =h i -h, and determine the mean difference. and the phase difference Δh between the maximum and minimum differences max -Δh min Is it within the set threshold range? If yes, proceed to step S7; otherwise, proceed to step S5.

[0050] In this embodiment, the threshold for the average difference is 5mm, and the threshold for the maximum and minimum difference is 10mm.

[0051] S5: Calculate the required elevation adjustment T for n jacks. i The calculation formula is:

[0052] T i =-Δh i *D / d+Rp

[0053] Rp=(Δh max -Δh min ) / n

[0054] In the formula, D represents the distance from the n front sling support points to the leading edge of the constructed main beam, d represents the distance from the end formwork position of the segment to be constructed to the leading edge of the constructed main beam, and Rp is the nonlinear correction term of the structure; T i A positive result indicates that the jack needs to be raised, while a negative result indicates that the jack needs to be lowered.

[0055] S6: n servo controllers 9 control the lifting and lowering of all jacks in a unified manner according to the corresponding elevation adjustment value.

[0056] S7: Turn off laser rangefinder 7 and restart the real-time dynamic differential measurement device to continue monitoring the absolute elevation of n bottom mold control points.

[0057] In the above-mentioned steps for measuring and controlling the elevation of the bottom formwork, step S1 is a monitoring step, steps S2 to S6 are adjustment steps, and step S7 is an inspection step.

[0058] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An automatic elevation monitoring system, characterized in that, This includes real-time dynamic differential measurement equipment, laser rangefinders, cloud computing platforms, and jack servo controllers; The real-time dynamic differential measurement equipment includes a base station and a rover station. The base station is a signal receiving station fixed at a ground standard surveying control point, used to receive satellite data and transmit it to the rover station in real time. The rover station, i.e., the measurement terminal, is set at the bottom formwork control point. While receiving satellite signals, it also receives geographic information data transmitted by the base station and calculates the absolute elevation of the bottom formwork control point for real-time monitoring of the bottom formwork elevation. The bottom formwork control point is set on the bottom formwork of the main beam, located on the perpendicular line between each front sling support point and the front edge of the constructed main beam, at the end formwork position of the segment to be constructed. The absolute elevation is the height of the bottom formwork control point relative to the national standard elevation reference line. The rhomboid truss is installed above the completed main beam. The laser rangefinder is set on the moving crossbeam of the rhomboid truss, corresponding vertically to each bottom formwork control point. The relative elevation of each bottom formwork control point is measured by vertically illuminating the bottom formwork control point with a laser. The relative elevation is the vertical distance of the bottom formwork control point relative to the moving crossbeam on the rhomboid truss, and is taken as a positive value. It is used to adjust the bottom formwork to the target elevation. The cloud computing platform receives and saves the absolute elevation of the bottom mold control point measured by the mobile station and the relative elevation of the bottom mold control point measured by the laser ranging sensor in the cloud, automatically calculates the required elevation adjustment value for each jack, and sends it to the jack servo controller. The jack servo controller is fixed on the front upper crossbeam. The jack servo controller controls the lifting and lowering of all jacks in a unified manner according to the elevation adjustment value calculated by the cloud computing platform, so as to realize the rapid and accurate adjustment of the bottom formwork elevation.

2. The automatic elevation monitoring system according to claim 1, characterized in that, The real-time dynamic differential measurement device, laser rangefinder, and jack servo controller are covered by a unified wireless local area network. The relative elevation and relative elevation data of the bottom mold control point are transmitted wirelessly to the cloud computing platform. The jack servo controller receives all elevation adjustment values ​​sent by the cloud computing platform wirelessly.

3. The automatic elevation monitoring system according to claim 1, characterized in that, There are four reference stations, arranged in pairs. The two reference stations in each pair are located on both sides of the mileage position of the bridge pier, and the line connecting each pair of reference stations is perpendicular to the center line of the bridge.

4. The automatic elevation monitoring system according to claim 1, characterized in that, The mobile station and the bottom mold control point are in one-to-one correspondence, and the number of bottom mold control points is 3 to 6.

5. A method for real-time measurement and control of the bottom formwork elevation based on the automatic elevation monitoring system according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1: The absolute elevation H of n bottom formwork control points is measured by a real-time dynamic differential measurement device. i The values ​​of i = 1, 2, ..., n are uploaded to the cloud computing platform, which will then determine the absolute elevation based on the absolute elevation: if there exists an absolute elevation H at any point... i The difference between the target elevation H and the target elevation H If the set threshold is exceeded, proceed to step S2; otherwise, continue monitoring the absolute elevation of each bottom mold control point. S2: Activate the laser rangefinder sensor to measure the relative elevation h of n bottom mold control points. i The data is then uploaded to the cloud computing platform, which first calculates the target relative elevation of each bottom model control point. ; S3: n laser rangefinders measure the real-time relative elevation of each bottom mold control point at a preset frequency, and obtain the updated relative elevation h of the bottom mold control points. i ; S4: The cloud computing platform recalculates the real-time relative elevation h of the n bottom mold control points. i The difference between its corresponding target relative elevation h And determine the mean difference. and the difference between the maximum and minimum values Is it within the set threshold range? If so, proceed to step S7. Otherwise proceed to step S5; S5: Calculate the required elevation adjustment T for n jacks. i The calculation formula is: ; ; In the formula, D represents the distance from the n front sling support points to the leading edge of the constructed main beam, d represents the distance from the end formwork position of the segment to be constructed to the leading edge of the constructed main beam, and Rp is the nonlinear correction term of the structure; T i A positive result indicates that the jack needs to be raised, while a negative result indicates that the jack needs to be lowered. S6: n servo controllers uniformly control the lifting and lowering of all jacks according to the corresponding elevation adjustment values; S7: Turn off the laser rangefinder and restart the real-time dynamic differential measurement equipment to continue monitoring the absolute elevation of the n bottom mold control points.

6. The method for real-time measurement and control of bottom formwork elevation according to claim 5, characterized in that, In step S3, the measurement frequency of the laser rangefinder is determined according to the extension and retraction speed of the jack, ensuring that the stroke of the jack is no more than 5mm during the time interval between two measurements.

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