A non-contact measuring device and method for bridge tower pier body template

Abstract

This application discloses a non-contact measuring device and method for bridge pier formwork, relating to the field of bridge construction surveying technology. The non-contact measuring device includes: four measuring mechanisms, respectively located at the four corners of the top of the pier formwork; each measuring mechanism includes two telescopic rods perpendicularly arranged to each other; the pier formwork includes four end-to-end connected panels; the two telescopic rods of each measuring mechanism are respectively located at the top of two connected panels, on the same plane as the panel, and extending outwards from the panel; each telescopic rod's end extending beyond the panel is connected to a prism; two prisms located at both ends of the same panel are symmetrically arranged about the center of the panel; and two total stations are respectively located on both sides of the pier formwork, each total station used to measure the coordinates of the four prisms facing the total station. This application enables non-contact measurement between surveyors and the pier formwork, reducing measurement safety risks, simplifying measurement procedures, and improving measurement efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction measurement, and in particular to a non-contact measurement device and method for a bridge tower pier body template. Background Art

[0002] At present, the height of the tower piers of large cable-stayed bridges is generally between 100-200m, and some even exceed 300m. The tower pier is the main structure of a large cable-stayed bridge, and is generally made of reinforced concrete. The tower pier body is constructed in sections by climbing formwork, with each section 4 to 6m high. Generally, the tower pier is constructed in 20 to 50 sections. The climbing formwork includes a construction climbing frame and a formwork. The construction climbing frame is the support frame of the formwork and the scaffolding for the construction of the tower pier body. The construction climbing frame is located outside the formwork and is higher than the formwork, which can easily block the line of sight of the formwork measurement or affect the satellite signal reception of the GNSS (Global Navigation Satellite System) receiver.

[0003] In the related art, the template position of the bridge tower pier is measured by the total station coordinate measurement method or the GNSS static measurement method. When the total station coordinate measurement method is used for measurement, at least 1 to 3 surveying professionals are required to climb to the upper construction area of ​​the bridge tower pier, erect a prism rod at the bridge tower pier body template and perform centering and leveling prism operations or place instruments for measurement operations. Since the construction climbing frame is located outside the template and is higher than the template, the prism rod needs to be erected 1.5m high or even 2m high during measurement to be higher than the construction climbing frame to ensure that the measurement line of sight is clear. When GNSS static measurement is used, 1 to 3 surveyors are required to carry a GNSS receiver, climb to the upper construction area of ​​the bridge tower pier, and place the GNSS receiver for measurement operations. Also, since the construction climbing frame is located outside the template and is higher than the template, it is necessary to set up the GNSS receiver in a small space in the bridge tower pier construction area at a height that is not affected by the construction climbing frame to avoid affecting the GNSS receiver's reception of satellite signals.

[0004] However, since the placement of the GNSS receiver and the centering and leveling of the prism mentioned above are professional surveying operations, they must be undertaken by professional surveyors. When measuring the tower pier body template, the surveyors must be in close contact with the tower pier body template to complete the measurement of the pier body template. The higher the prism pole is erected, the greater the measurement error and the lower the measurement accuracy. The higher the GNSS receiver is set up, the more difficult the installation operation is, which will also affect the measurement accuracy. Therefore, the above two methods will not only occupy more surveyors, be time-consuming and labor-intensive, and have low measurement efficiency, but also have greater safety risks. Summary of the invention

[0005] In response to one of the defects existing in the prior art, the purpose of the present application is to provide a non-contact measurement device and method for bridge tower pier body formwork, so as to solve the problem in the related technology that the measurement process occupies a large number of measurement personnel, is time-consuming and labor-intensive, has low measurement efficiency, and has high safety risks.

[0006] The first aspect of the present application provides a non-contact measuring device for a bridge tower pier body formwork, comprising:

[0007] Four measuring mechanisms are respectively arranged at the four corners of the top of the pier body template, each measuring mechanism includes two telescopic rods arranged perpendicularly to each other, the pier body template includes four enclosures connected end to end, the two telescopic rods of each measuring mechanism are respectively arranged at the top of two connected enclosures, and are located in the same plane as the enclosures where they are located, and extend outward from the enclosures, each telescopic rod is connected to a prism at the end extending out of the enclosure, and the two prisms located at the two ends of the same enclosure are symmetrically arranged about the center of the enclosure;

[0008] Two total stations are respectively arranged on both sides of the pier body formwork, and each total station is used to measure the coordinates of four prisms facing the total station.

[0009] In some embodiments, the top surfaces of the two connected enclosures are not in the same plane, and the height difference between the two top surfaces is the height of the telescopic rod located at the bottom in the measuring mechanism.

[0010] In some embodiments, the measuring mechanism further comprises a connecting member, and the connecting member comprises:

[0011] A U-shaped plate, forming a U-shaped slot for the telescopic rod located below to pass through and rest on;

[0012] There are four clamping plates, which are symmetrically arranged in pairs on the open end surface of the above-mentioned U-shaped plate to form a cross cavity connected to the above-mentioned U-shaped groove. The cavity in the above-mentioned cross cavity that is perpendicular to the U-shaped groove is for the telescopic rod located above to pass through, and the telescopic rod is placed on the telescopic rod located below.

[0013] In some embodiments, the U-shaped plate includes two parallel arm plates and a transverse plate connecting the two arm plates, and the clamping plate and the arm plates are arranged perpendicular to each other.

[0014] In some embodiments, the portion of the bottom surface of the clamping plate that is not connected to the arm plate is connected to the arm plate via reinforcing ribs.

[0015] In some embodiments, the measuring mechanism further comprises a support rod, and both ends of the support rod are respectively provided with a hinged ring, wherein one hinged ring is hinged to the side wall of the pier body formwork, and the other hinged ring is hinged to the U-shaped plate.

[0016] In some embodiments, the support rod is a retractable structure.

[0017] The second aspect of the present application provides a measurement method based on the above-mentioned bridge tower pier body formwork non-contact measurement device, which comprises the steps of:

[0018] Four measuring mechanisms are respectively installed at the four corners of the top of the pier body formwork;

[0019] A control point is set on each side of the pier body formwork, and total stations are installed at the two control points respectively, so that the total station at one control point looks back at the other control point;

[0020] The coordinates of the four prisms facing the two total stations are measured respectively;

[0021] Calculate the average coordinates of the two prisms connected to the same panel as the measured coordinates of the center of the panel, and obtain the measured coordinates of the centers of the four panels;

[0022] Calculate the differences between the measured coordinates of the centers of the four panels and their theoretical coordinates respectively as the offset values ​​of the four panels, and adjust the positions of the four panels until the above offset values ​​are zero.

[0023] In some embodiments, four measuring mechanisms are respectively installed at the four corners of the top of the pier body formwork, specifically including:

[0024] The two telescopic rods of each measuring mechanism are respectively arranged at the top ends of two connected enclosures and are located in the same plane as the enclosures. A prism is installed at the end of each telescopic rod extending outside the enclosure, and the two prisms located at both ends of the same enclosure are symmetrical about the center of the above enclosure.

[0025] In some embodiments, the measuring device further comprises a connecting member, the connecting member comprising a U-shaped plate having a U-shaped groove and four clamping plates, the four clamping plates being symmetrically arranged in pairs on the open end surface of the U-shaped plate to form a cross cavity communicating with the U-shaped groove;

[0026] After the two telescopic rods of each measuring mechanism are respectively arranged at the top ends of the two connected enclosures, the invention also includes:

[0027] The connecting piece is clamped on two vertically arranged telescopic tubes from bottom to top, so that the telescopic tube located at the bottom passes through and is placed in the U-shaped groove, and the telescopic tube located at the top passes through the cavity in the cross cavity that is perpendicular to the U-shaped groove and is placed on the telescopic rod at the bottom;

[0028] One end of the support rod is connected to the bottom end of the U-shaped plate, and the other end is connected to the side wall of a enclosure.

[0029] The beneficial effects of the technical solution provided by this application include:

[0030] The non-contact measuring device and method for the bridge tower pier body formwork of the present application has a prism connected to each side of the upper end face of each enclosure through a telescopic rod, and the two prisms located at both ends of the same enclosure are symmetrically arranged about the center of the enclosure. The coordinates of the four prisms facing each total station can be measured by the total station on both sides of the pier body formwork, and the eight coordinates obtained can be processed to obtain the actual measured coordinates of the four enclosures. Therefore, not only can non-contact measurement between the surveying personnel and the pier body formwork be achieved, avoiding the surveying personnel climbing up and down the pier body formwork and reducing the safety risks of measurement, but also the measurement process can be simplified, the configuration of surveying personnel can be reduced, and the measurement efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the first installation of four measuring mechanisms in an embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the structure of the connecting member of an embodiment of the present application;

[0033] Figure 3 for Figure 2 Side view of

[0034] Figure 4 This is a schematic diagram of the structure of the support rod of an embodiment of the present application;

[0035] Figure 5 This is a schematic diagram of the second installation of the four measuring mechanisms of the embodiment of the present application;

[0036] Figure 6 This is a flow chart of the measurement method according to an embodiment of the present application;

[0037] Figure 7 This is a schematic diagram of the installation of a non-contact measurement device for a bridge tower pier body formwork according to an embodiment of the present application.

[0038] Reference numerals:

[0039] 1. Pier body formwork; 11. First enclosure; 12. Second enclosure; 13. Third enclosure; 14. Fourth enclosure;

[0040] 2. telescopic rod; 21. first telescopic rod; 22. second telescopic rod; 23. third telescopic rod; 24. fourth telescopic rod; 25. fifth telescopic rod; 26. sixth telescopic rod; 27. seventh telescopic rod; 28. eighth telescopic rod;

[0041] 3. Prism; 31. First prism; 32. Second prism; 33. Third prism; 34. Fourth prism; 35. Fifth prism; 36. Sixth prism; 37. Seventh prism; 38. Eighth prism;

[0042] 4. Connecting piece; 41. U-shaped plate; 42. Clamping plate; 43. Reinforcing rib; 44. Articulated seat;

[0043] 5. Support rod; 51. Articulated ring;

[0044] 6. The first total station; 7. The second total station; 8. The tower pier. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] The embodiments of the present application provide a non-contact measurement device and method for a bridge tower pier body formwork, which can solve the problems in the related art that the measurement process occupies a large number of measurement personnel, is time-consuming and labor-intensive, has low measurement efficiency, and has high safety risks.

[0047] like Figure 1 As shown, an embodiment of the present application provides a non-contact measurement device for a bridge tower pier body formwork, which includes four measurement mechanisms and two total stations.

[0048] Four measuring mechanisms are respectively arranged at the four corners of the top of the pier body formwork 1, and each measuring mechanism includes two telescopic rods 2 arranged perpendicular to each other. The above-mentioned pier body formwork 1 includes four panels connected end to end. The two telescopic rods 2 of each measuring mechanism are respectively arranged at the top of the two connected panels, and are located in the same plane as the panels where they are located, and extend outward from the panels. The end of each telescopic rod 2 extending outside the panel is connected to a prism 3, and the two prisms 3 located at the two ends of the same panel are symmetrically arranged about the center of the panel.

[0049] The center of the end of each telescopic rod 2 is provided with a prism boss for mounting a prism, and each prism is mounted on the prism boss of a telescopic rod. The specifications and dimensions of each telescopic rod 2 are the same.

[0050] Two total stations are respectively arranged on both sides of the pier body formwork 1, and each total station is used to measure the coordinates of four prisms 3 facing the total station.

[0051] The contactless measuring device for the pier body formwork of the bridge tower pier of the embodiment of the present application has a prism 3 connected to each side of the upper end face of each panel via a telescopic rod 2, and the two prisms 3 located at both ends of the same panel are symmetrically arranged about the center of the panel. The total station on both sides of the pier body formwork 1 can be used to measure the coordinates of the four prisms facing each total station, and the obtained eight coordinates can be processed to obtain the actual measured coordinates of the four panels. Therefore, the measuring device is not only simple in structure, but also can realize contactless measurement between the surveying personnel and the pier body formwork, avoid the surveying personnel climbing up and down the pier body formwork, reduce the safety risk of measurement, and can also simplify the measurement process, reduce the configuration of surveying personnel, and improve the measurement efficiency.

[0052] In this embodiment, the top surfaces of the two connected enclosures are not in the same plane, and the height difference between the two top surfaces is the height of the telescopic rod 2 located below in the measuring mechanism, thereby ensuring that the two telescopic rods 2 in the measuring mechanism are closely attached to each other.

[0053] like Figure 2 and Figure 3 As shown, preferably, each measuring mechanism further comprises a connecting member 4, and each of the connecting members 4 comprises a U-shaped plate 41 and a clamping plate 42. The two telescopic rods 2 of each measuring mechanism are respectively an upper telescopic rod and a lower telescopic rod.

[0054] The U-shaped plate 41 forms a U-shaped groove for the telescopic rod 2 located below to pass through and rest.

[0055] There are four clamping plates 42, which are symmetrically arranged in pairs on the open end surface of the above-mentioned U-shaped plate 41. The four clamping plates 42 form a cross cavity connected to the above-mentioned U-shaped groove. The cavity in the above-mentioned cross cavity that is perpendicular to the U-shaped groove is for the telescopic rod 2 located above to pass through, and the telescopic rod 2 is placed on the telescopic rod 2 located below.

[0056] In this embodiment, the U-shaped plate 41 includes two parallel arm plates and a horizontal plate connecting the two arm plates, and the clamping plate 42 is perpendicularly arranged to the arm plates. In this embodiment, the height of the arm plates does not exceed the height of the telescopic rods, so that the telescopic rod located at the upper side can be placed on the telescopic rod located at the lower side.

[0057] Optionally, the portion of the bottom surface of the clamping plate 42 that is not connected to the arm plate is connected to the arm plate via a reinforcing rib 43. The reinforcing rib 43 can increase the connection strength between the clamping plate 42 and the U-shaped plate 41.

[0058] like Figure 4As shown, further, each measuring mechanism also includes a support rod 5, and each support rod 5 is provided with a hinge ring 51 at both ends, one of which is hinged to the side wall of the pier body formwork 1, and specifically, the hinge ring is hinged to the connection of two adjacent panels of the support rod 5. The other hinge ring is hinged to the above-mentioned U-shaped plate 41. Optionally, the end surface of the U-shaped plate 41 away from the clamping plate 42 is provided with a hinge seat 44 hinged to the hinge ring 51.

[0059] Optionally, the support rod 5 is a telescopic structure so that the length can be adjusted according to the hinge position of the U-shaped plate 41 and the side wall of the enclosure.

[0060] like Figure 5 As shown, optionally, for the aesthetics of the tower column of the bridge tower pier, two adjacent enclosure panels can be connected by a corner plate, one hinge ring of the support rod 5 is hinged to the side wall of the corner plate adjacent to the support rod 5, and the other hinge ring is hinged to the U-shaped plate 41.

[0061] like Figure 6 As shown, the embodiment of the present application also provides a measurement method based on the above-mentioned bridge tower pier body formwork non-contact measurement device, which includes the steps of:

[0062] S1. Install four measuring mechanisms at the four corners of the top of the pier body formwork 1 respectively.

[0063] S2. A control point is set on each side of the pier body formwork 1, and total stations are installed at the two control points respectively, so that the total station at one control point looks back at the other control point.

[0064] Among them, the control points on both sides of the pier body formwork 1 are control points with known coordinates.

[0065] S3. Use two total stations to measure the coordinates of the four prisms 3 that the total stations are facing.

[0066] S4. Calculate the average coordinates of the two prisms 3 connected to the same enclosure as the measured coordinates of the center of the enclosure, and obtain the measured coordinates of the centers of the four enclosures.

[0067] S5. Calculate the differences between the measured coordinates of the centers of the four panels and their theoretical coordinates respectively, and use them as the offset values ​​of the four panels. Adjust the positions of the four panels until the offset values ​​are zero.

[0068] In this embodiment, the measured coordinates of the center of each enclosure can be obtained by observing the measured coordinates of two prisms horizontally symmetrically placed on the same enclosure and taking the average value.

[0069] In this embodiment, in the above step S1, four measuring mechanisms are respectively installed at the four corners of the top of the above pier body formwork 1, specifically including:

[0070] The two telescopic rods 2 of each measuring mechanism are respectively arranged at the top ends of two connected enclosures and are located in the same plane as the enclosures. A prism 3 is installed at the end of each telescopic rod 2 extending outside the enclosure. By adjusting the length of the telescopic rod 2, the two prisms 3 located at the two ends of the same enclosure are made symmetrical about the center of the above-mentioned enclosure.

[0071] Among them, the telescopic rod 2 is arranged horizontally and symmetrically, which does not require centering and leveling operations and is convenient for extending the prism 3 out of the construction climbing frame, can overcome the obstruction of the measurement line of sight by the construction climbing frame, and facilitate the smooth implementation of the measurement work.

[0072] Furthermore, the measuring device further comprises a connecting member 4, the connecting member 4 comprises a U-shaped plate 41 formed with a U-shaped groove and four clamping plates 42, the four clamping plates 42 are symmetrically arranged in pairs on the opening end surface of the U-shaped plate 41 to form a cross cavity connected to the U-shaped groove;

[0073] After the two telescopic rods 2 of each measuring mechanism are respectively arranged at the top ends of the two connected enclosures, the invention also includes:

[0074] First, the connector 4 is clamped on the two vertically arranged telescopic tubes from bottom to top, so that the telescopic tube at the bottom passes through and is placed in the U-shaped groove, and the telescopic tube at the top passes through the cavity in the cross cavity that is perpendicular to the U-shaped groove and is placed on the telescopic rod 2 at the bottom;

[0075] Then, one end of the support rod 5 is connected to the bottom end of the U-shaped plate 41 , and the other end is connected to a side wall of a surrounding plate to increase the stability of the telescopic rod 2 .

[0076] Taking the center of the top surface of the pier body template as the coordinate origin, the transverse bridge direction as the X axis, the longitudinal bridge direction as the Y axis, and setting the positive directions of the X axis and the Y axis, the pier body template is divided into four quadrants. Among them, the quadrant area surrounded by the positive direction of the X axis and the positive direction of the Y axis is the first quadrant, the quadrant area surrounded by the positive direction of the X axis and the negative direction of the Y axis is the second quadrant, the quadrant area surrounded by the negative direction of the X axis and the negative direction of the Y axis is the third quadrant, and the quadrant area surrounded by the negative direction of the X axis and the positive direction of the Y axis is the fourth quadrant.

[0077] In the first quadrant, the telescopic rod arranged along the X-axis is the first telescopic rod 21, on which the first prism 31 is installed, and the telescopic rod arranged along the Y-axis is the second telescopic rod 22, on which the second prism 32 is installed. The second telescopic rod 22 is located above the first telescopic rod 21, and the two are vertically crossed and closely attached.

[0078] In the second quadrant, the telescopic rod arranged along the X-axis is the third telescopic rod 23, on which the third prism 33 is installed, and the telescopic rod arranged along the Y-axis is the fourth telescopic rod 24, on which the fourth prism 34 is installed. The fourth telescopic rod 24 is located above the third telescopic rod 23, and the two are vertically crossed and closely attached.

[0079] In the third quadrant, the telescopic rod arranged along the X-axis is the fifth telescopic rod 25, on which the fifth prism 35 is installed, and the telescopic rod arranged along the Y-axis is the sixth telescopic rod 26, on which the sixth prism 36 is installed. The sixth telescopic rod 26 is located above the fifth telescopic rod 25, and the two are vertically crossed and closely attached.

[0080] In the fourth quadrant, the telescopic rod arranged along the X-axis is the seventh telescopic rod 27, on which the seventh prism 37 is mounted, and the telescopic rod arranged along the Y-axis is the eighth telescopic rod 28, on which the eighth prism 38 is mounted. The eighth telescopic rod 28 is located above the seventh telescopic rod 27, and the two are vertically crossed and closely attached.

[0081] like Figure 7 As shown, the two total stations are respectively the first total station 6 and the second total station 7. The first total station 6 is located at the first control point and looks back at the second control point. The first total station 6 can aim at the four prisms located in the second quadrant and the third quadrant, and adopts the polar coordinate measurement method to collect the coordinates of the third prism 33, the fourth prism 34, the fifth prism 35 and the sixth prism 36. The second total station is located at the second control point and looks back at the first control point. The second total station 7 can aim at the four prisms located in the first quadrant and the fourth quadrant, and adopts the polar coordinate measurement method to collect the coordinates of the first prism 31, the second prism 32, the seventh prism 37 and the eighth prism 38.

[0082] The panels located in the first and second quadrants are the first panels 11 , the panels located in the second and third quadrants are the second panels 12 , the panels located in the third and fourth quadrants are the third panels 13 , and the panels located in the fourth quadrant and the first quadrant are the fourth panels 14 .

[0083] The average coordinates of the second prism 32 and the fourth prism 34 are calculated as the measured coordinates of the center of the first enclosure panel 11 .

[0084] The average coordinates of the third prism 33 and the fifth prism 35 are calculated as the measured coordinates of the center of the second enclosure panel 12 .

[0085] The average coordinates of the sixth prism 36 and the eighth prism 38 are calculated as the measured coordinates of the center of the third enclosure panel 13 .

[0086] The average coordinates of the seventh prism 37 and the first prism 31 are calculated as the measured coordinates of the center of the fourth enclosure panel 14 .

[0087] After obtaining the measured coordinates of the centers of the four hoardings, the difference between the measured coordinates of the centers of the four hoardings and their theoretical coordinates can be calculated, and then this difference can be used as a guide to adjust each hoarding into place.

[0088] The measuring method of this embodiment is applicable to the above-mentioned measuring devices. Not only is the measuring process simple, but also the template measurement of the tall pier body of the bridge tower pier can be carried out by only placing a total station on the ground control point. There is no need for professional surveyors to spend time and effort to go up and down the bridge tower pier body to carry out operations. Contactless measurement between the surveyors and the pier body template is achieved, and compared with the existing method of measuring the erected prism coordinates by the total station coordinate method, the measuring accuracy is higher.

[0089] The present application is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A measurement method based on a non-contact measurement device for a bridge tower pier body formwork, characterized in that: The device comprises: Four measuring mechanisms are respectively arranged at four corners of the top of the pier body template (1), each measuring mechanism comprises two telescopic rods (2) arranged perpendicular to each other, the pier body template (1) comprises four enclosures connected end to end, the two telescopic rods (2) of each measuring mechanism are respectively arranged at the top of two connected enclosures, and are located in the same plane as the enclosures, and extend outward from the enclosures, the end of each telescopic rod (2) extending outside the enclosure is connected to a prism (3), and the two prisms (3) located at the two ends of the same enclosure are symmetrically arranged about the center of the enclosure; Two total stations are respectively arranged on both sides of the pier body formwork (1), and each total station is used to measure the coordinates of four prisms (3) facing the total station; The method comprises the steps of: Four measuring mechanisms are respectively installed at the four corners of the top of the pier body formwork (1); A control point is respectively set on both sides of the pier body formwork (1), and total stations are respectively installed at the two control points, so that the total station at one control point looks back at the other control point; Using two total stations, the coordinates of four prisms (3) that the total stations are facing are measured respectively; Calculate the average coordinates of two prisms (3) connected to the same enclosure as the measured coordinates of the center of the enclosure, and obtain the measured coordinates of the centers of the four enclosures; The differences between the measured coordinates of the centers of the four panels and their theoretical coordinates are calculated respectively as the offset values ​​of the four panels, and the positions of the four panels are adjusted until the offset values ​​are zero.

2. The measuring method according to claim 1, characterized in that: The top surfaces of the two connected enclosures are not in the same plane, and the height difference between the two top surfaces is the height of the telescopic rod (2) located at the bottom in the measuring mechanism.

3. The measuring method according to claim 1, characterized in that: The measuring mechanism further comprises a connecting member (4), wherein the connecting member (4) comprises: A U-shaped plate (41) forms a U-shaped groove for the telescopic rod (2) located below to pass through and rest on; Four clamping plates (42) are provided, and are symmetrically arranged in pairs on the open end surface of the U-shaped plate (41) to form a cross cavity connected to the U-shaped groove, and the cavity in the cross cavity perpendicular to the U-shaped groove is used for the telescopic rod (2) located above to pass through, and the telescopic rod (2) is placed on the telescopic rod (2) located below.

4. The measuring method according to claim 3, characterized in that: The U-shaped plate (41) comprises two arm plates arranged in parallel and a transverse plate connecting the two arm plates, and the clamping plate (42) and the arm plates are arranged perpendicular to each other.

5. The measuring method according to claim 4, characterized in that: The portion of the bottom surface of the clamping plate (42) not connected to the arm plate is connected to the arm plate via a reinforcing rib (43).

6. The measuring method according to claim 3, characterized in that: The measuring mechanism also includes a support rod (5), and each of the two ends of the support rod (5) is provided with a hinge ring (51), one of the hinge rings is hinged to the side wall of the pier body formwork (1), and the other hinge ring is hinged to the U-shaped plate (41).

7. The measuring method according to claim 6, characterized in that: The support rod (5) is a telescopic structure.

8. The measuring method according to claim 1, characterized in that: Four measuring mechanisms are respectively installed at the four corners of the top of the pier body formwork (1), specifically comprising: The two telescopic rods (2) of each measuring mechanism are respectively arranged at the top ends of two connected enclosures and are located in the same plane as the enclosures. A prism (3) is installed at the end of each telescopic rod (2) extending outside the enclosure, and the two prisms (3) located at the two ends of the same enclosure are symmetrical about the center of the enclosure.

9. The measuring method according to claim 8, characterized in that: The measuring device further comprises a connecting member (4), the connecting member (4) comprising a U-shaped plate (41) formed with a U-shaped groove and four clamping plates (42), the four clamping plates (42) being symmetrically arranged in pairs on the open end surface of the U-shaped plate (41) to form a cross cavity communicating with the U-shaped groove; After the two telescopic rods (2) of each measuring mechanism are respectively arranged at the top ends of the two connected enclosures, the method further comprises: The connecting piece (4) is clamped on two vertically arranged telescopic tubes from bottom to top, so that the telescopic tube located at the bottom passes through and is placed in the U-shaped groove, and the telescopic tube located at the top passes through the cavity in the cross cavity that is perpendicular to the U-shaped groove and is placed on the telescopic rod (2) at the bottom; One end of the support rod (5) is connected to the bottom end of the U-shaped plate (41), and the other end is connected to the side wall of a surrounding plate.

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