Suspension bridge anti-shaking reference cable elevation measuring device and measuring method thereof

Abstract

The invention relates to an elevation measuring device and method for an anti-shaking reference cable of a suspension bridge. The elevation measuring device comprises two auxiliary cable strands; the clamp set comprises a plurality of cable strand clamps, three of the cable strand clamps are main clamps used for being installed on the midspan of a reference cable strand and the midspan of two auxiliary cable strands respectively, a prism set is arranged on the main clamps in a plumb bob mode, and at least one cable strand clamp is an auxiliary clamp used for being installed on the auxiliary cable strands; the cable strand clamp on one auxiliary cable strand is connected with the cable strand clamp on the other auxiliary cable strand through the supporting rod, and the cable strand clamp on the auxiliary cable strand is further provided with the supporting rod used for being connected with the cable strand clamp on the reference cable strand; and a total station. The stable geometry is formed between the anti-shaking reference cable height measurement device and the two auxiliary cable strands, shaking of the reference cable strands is effectively weakened, the device adapts to the marine environment, and the measurement precision is high.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction measurement, and in particular to an elevation measurement device and a measurement method for an anti-sway reference cable of a suspension bridge. Background Art

[0002] Cables, the key load-bearing structure of suspension bridges, play a vital role in supporting the bridge. They are composed of dozens or even hundreds of strands, including standard and reference strands. During construction, each strand is installed individually, followed by winding and other processes to form a complete cable. The reference strand serves as the benchmark for cable installation and measurement.

[0003] Reference cable strands can be hundreds or even thousands of meters long. Their elevation and sag are extremely sensitive to atmospheric temperature fluctuations, making them prone to deformation. Therefore, when measuring reference cable elevation, it is typically performed at night when there is no wind or a breeze of less than level 3, no sunlight, and minimal temperature fluctuations. This ensures that the reference cable strands are in equilibrium, thereby obtaining more accurate measurement data.

[0004] However, for cross-sea suspension bridges, even at night when there is no sunlight and the temperature difference is small, strong winds of 3 to 6 are common. Such strong winds can cause the reference cables to sway, posing a great challenge to the elevation measurement work.

[0005] In related technologies, the elevation measurement of reference cable strands typically uses a fitting elevation measurement method. This method requires measuring multiple reference cable strand elevation points and performing calculations based on cable axis theory. This method results in relatively low measurement accuracy and is in urgent need of improvement. Summary of the Invention

[0006] The embodiments of the present application provide a suspension bridge anti-sway reference cable elevation measurement device and a measurement method thereof to solve the problem in related technologies that multiple reference cable elevation measurement points need to be measured and calculations must be performed based on the cable axis theory formula, resulting in relatively low measurement accuracy.

[0007] In a first aspect, a suspension bridge anti-sway reference cable elevation measurement device is provided, comprising:

[0008] Two auxiliary cables;

[0009] A fixture assembly comprising a plurality of strand fixtures, wherein three of the strand fixtures are main fixtures for installation at the mid-span of a reference strand and two auxiliary strands, respectively, a prism assembly being provided on a plumb bob of the main fixtures, and at least one strand fixture is an auxiliary fixture for installation on an auxiliary strand;

[0010] a plurality of support rods, wherein a strand clamp on one auxiliary strand is connected to a strand clamp on another auxiliary strand via a support rod, and the strand clamps on the auxiliary strands are further equipped with support rods for connecting to the strand clamps on the reference strand;

[0011] and a total station.

[0012] In some embodiments, the support rod is a telescopic rod;

[0013] The device also includes an inclinometer and a level.

[0014] In some embodiments, the prism group includes two prisms and a prism rod, the two prisms are arranged opposite to each other and fixedly mounted to one end of the prism rod, the center line of the two prisms is perpendicular to the prism rod, and a level bubble is provided on the prism rod.

[0015] In some embodiments, each of the strand clamps includes at least two clamps and a fastener. When the clamps are connected by the fastener, the inner hole formed by the clamps has the same shape and size as the cross-section of the reference strand or the auxiliary strand.

[0016] In some embodiments, the telescopic rod includes a sliding rod and a sleeve that are slidably connected. The sleeve is rotatably connected to one end of the sliding rod to fix the sliding rod and the sleeve. The sliding rod and the sleeve on the same telescopic rod are hinged to the clamps on different cable strand clamps at one end away from each other.

[0017] Secondly, a method for measuring the elevation of an anti-sway reference cable of a suspension bridge is provided, comprising the following steps:

[0018] After installing the auxiliary cables and reference cables, install the main fixture and prism assembly at the mid-span of the auxiliary cables and reference cables, and connect the main fixtures with support rods.

[0019] Installing an auxiliary clamp on an auxiliary strand, and connecting the auxiliary clamp to the strand clamp on another auxiliary strand and the strand clamp on the reference strand using a support rod;

[0020] Measure the mid-span height difference between the reference cable strand and the auxiliary cable strand as the known mid-span height difference;

[0021] Measure the actual mid-span elevations of the base cable and auxiliary cable;

[0022] The accuracy of the actual mid-span elevation of the reference cable strand is determined based on the deviation between the actual mid-span elevation difference of the reference cable strand and the two auxiliary cable strands and the known mid-span elevation difference.

[0023] In some embodiments, measuring the mid-span height difference between the reference strand and the auxiliary strand as the known mid-span height difference comprises the following steps:

[0024] On the mid-span plumb bob cross sections of the reference cable strand and the auxiliary cable strands, a level with a bidirectional inclinometer is used to measure the height difference between the reference cable strand and the two bundles of auxiliary cable strands respectively, which is taken as the known mid-span height difference between the reference cable strand and the two bundles of auxiliary cable strands.

[0025] In some embodiments, measuring the actual mid-span elevations of the reference strand and the auxiliary strand comprises the following steps:

[0026] Two total stations are installed on two control points on both sides of the suspension bridge with known elevations and plane coordinates;

[0027] The differential elevations of the prism groups were measured using total stations on both sides of the prism. Based on the differential elevations of the three prism groups and the lengths of the prism rods, the actual elevations of the reference strand and the two auxiliary strands at the plumb bob cross section at their mid-span were calculated.

[0028] In some embodiments, determining the accuracy of the actual mid-span elevation of the reference strand based on the deviation between the actual mid-span elevation difference of the reference strand and the two bundles of auxiliary strands and the known mid-span elevation difference comprises the following steps:

[0029] Based on the actual elevations of the reference cable strand and the two auxiliary cable strands at the plumb bob cross section at their mid-span, calculate the actual mid-span height difference between the reference cable strand and the auxiliary cable strands, and compare the deviation between the actual mid-span height difference and the known mid-span height difference;

[0030] If the deviation between the actual mid-span height difference between the reference cable strand and the two auxiliary cable strands and the known mid-span height difference exceeds the allowable deviation, repeat the above steps until the difference is less than the allowable deviation, and use the actual measured elevation value as the mid-span elevation of the reference cable strand.

[0031] In some embodiments, measuring the differential elevation of each prism group using total stations on both sides includes: measuring the measured elevation of each prism in the prism group, taking the average of the measured elevations of each prism as the measured elevation value, and obtaining the differential elevation of the prism group based on the measured elevation value.

[0032] The present invention provides an apparatus and method for measuring the elevation of a suspension bridge's anti-sway reference cable. The apparatus utilizes a reference cable strand and two bundles of auxiliary cables spaced at predetermined heights. The different reference cables and auxiliary cables are connected by support rods, forming a stable geometric structure. This effectively reduces reference cable sway and helps ensure the accuracy of reference cable elevation measurement. By establishing known geometric elevation differences between points in a triangle ABC, the accuracy of the actual elevation of point A in the swaying reference cable is determined based on whether the deviation between the actual elevation difference between points A, B, and C and their known geometric elevation difference is less than a threshold, thereby improving measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 A schematic diagram of the installation environment of the anti-sway reference cable elevation measurement device provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the installation of the anti-sway reference cable elevation measurement device provided in an embodiment of the present application on a suspension bridge cable strand;

[0036] Figure 3 A schematic structural diagram of an anti-sway reference cable elevation measurement device provided in an embodiment of the present application;

[0037] Figure 4 A flow chart of a method for measuring the elevation of an anti-sway reference cable of a suspension bridge is provided for an embodiment of the present application.

[0038] In the figure: 1. Reference cable strand; 2. Auxiliary cable strand; 3. Cable strand clamp; 31. Clamp; 32. Fixing screw; 33. Hinge seat; 4. Telescopic rod; 41. Sliding rod; 42. Sleeve; 43. Fastening screw; 44. Damper; 5. Prism assembly; 51. Prism; 52. Prism rod; 6. First total station; 7. Second total station. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] An embodiment of the present application provides a device for measuring the elevation of an anti-sway reference cable of a suspension bridge, which can solve the problem in related technologies that multiple reference cable elevation measurement points need to be measured and calculations must be performed based on the cable axis theory formula, resulting in relatively low measurement accuracy.

[0041] like Figures 1 to 3 As shown, the suspension bridge anti-sway reference cable elevation measurement device includes:

[0042] Two auxiliary strands 2 are arranged at a certain height from the reference strand 1 so that the reference strand 1 and the auxiliary strand 2 form an acute triangle in the cross section of the plumb bob at the mid-span;

[0043] A fixture assembly includes four strand fixtures 3, three of which are main fixtures, fixed at the mid-span positions of the reference strand 1 and two auxiliary strands 2, respectively. The center of the regular hexagon of the reference strand 1 fixed by the main fixture is denoted as point A, and the centers of the regular hexagons of the two auxiliary strands 2 fixed by the main fixture are denoted as points B and C, respectively. A prism assembly 5 is provided on a plumb bob on each main fixture. There is also a strand fixture 3, which is an auxiliary fixture, installed on one of the auxiliary strands 2 near the mid-span position.

[0044] Five support rods 4, each of which has its ends connected to the strand clamps on different strands. For example, the strand clamp 3 on one auxiliary strand 2 is connected to the strand clamp 3 on another auxiliary strand 2 via a support rod 4. The strand clamp 3 on the auxiliary strand 2 is also equipped with a support rod 4 for connecting to the strand clamp 3 on the reference strand 1.

[0045] And the total station includes a first total station 6 and a second total station 7. The first total station 6 and the second total station 7 are respectively installed on two control points with known elevations and plane coordinates on both sides of the suspension bridge.

[0046] By adopting the above solution, relying on the reference cable strand 1 and two bundles of auxiliary cable strands 2 installed at a certain height, different reference cables 1 and auxiliary cable strands 2 are connected by support rods 4. Therefore, the reference cables 1 and auxiliary cable strands 2 form a stable cone together, effectively reducing the shaking of the reference cable strand 1, which is conducive to ensuring the accuracy of the reference cable strand elevation measurement.

[0047] In some optional embodiments, multiple auxiliary clamps can be provided on the auxiliary strand 2, with the number of support rods 4 adapted to the number of auxiliary clamps. Multiple auxiliary clamps, combined with an adapted number of support rods 4, can create a denser connection network between the reference strand 1 and the auxiliary strands 2. Adding more auxiliary clamps and support rods 4 to the stable conical structure strengthens the restraint and support of the reference strand 1, further enhancing the spatial structural stability of the entire measurement device and more effectively preventing the influence of external factors on the reference strand's sway, thereby improving measurement accuracy.

[0048] In some optional embodiments, support rod 4 is of a known fixed length. In this embodiment, support rod 4 is a telescopic rod, allowing for flexible length adjustment to accommodate varying measurement environments and cable strand installation conditions, further enhancing the device's adjustability and stability. When support rod 4 is a telescopic rod, the device also includes an inclinometer and a spirit level. The inclinometer is a bidirectional instrument, which measures the inclination angles of the hexagonal center edge of the reference cable strand 1 and the same-side hexagonal center edge of the auxiliary cable strands 2 relative to the horizontal plane. The spirit level measures the slant distances between the hexagonal center edge of the reference cable strand 1 and the same-side hexagonal center edges of the two bundles of auxiliary cable strands 2.

[0049] When the support rod 4 is a telescopic rod, the telescopic rod 4 comprises a sliding rod 41 and a sleeve 42, which are slidably connected. The outer diameter of the sliding rod 41 matches the inner diameter of the sleeve 42, allowing the sliding rod 41 to extend and retract along the sleeve 42. The sleeve 42 is rotatably connected to a fastener, a set screw 43, at one end adjacent to the sliding rod 41 to securely connect the sliding rod 41 and the sleeve 42. A hinged fork is provided at the end of the sliding rod 41 and the sleeve 42 facing away from each other on the same telescopic rod 4. The hinged fork mates with the hinge seat 33 on the cable clamp 3, securing one end of the sliding rod 41 and the sleeve 42 to the clamp 31.

[0050] In this embodiment, a damper 44 is provided on the telescopic rod 4 to reduce the shaking of the telescopic rod 4 caused by environmental influences.

[0051] In some embodiments, the prism assembly 5 includes two prisms 51 and a prism rod 52. The two prisms 51 are positioned opposite each other and fixed to one end of the prism rod 52. The centerline connecting the two prisms 51 is perpendicular to the prism rod 52. The prism rod 52 is provided with a bubble level, and a protrusion is provided at the lower end of the prism rod 52. During installation, the prisms 51 are plumb-mounted on the cable clamp 2 using the bubble level on the prism rod 52. The protrusion at the lower end of the prism rod 52 is locked into the arc-shaped groove on the outer wall of the clamp 31 using a clamping screw. The two prisms 51 are positioned at one end of the prism rod 52. During measurement, the first total station 6 and the second total station 7 respectively measure the elevation of the two prisms 51 in the prism assembly 5. The average of the elevations of the two prisms 51 is taken as the actual elevation of the prism assembly 5, which helps improve measurement accuracy.

[0052] In some embodiments, each strand clamp 3 includes two clamps 31 and a fastener, the fastener being a set screw 32. When connected by the fastener, the clamps 31 have a circular exterior. The inner hole formed by the clamps 31 has the same cross-sectional shape and size as the reference strand 1 or the auxiliary strand 2, i.e., the inner hole is a regular hexagon, and is used to clamp the reference strand 1 or the auxiliary strand 2 at the mid-span. The outer wall of the clamps 31 has multiple hinges 33, each with a tightening pin for connecting to and tightening the telescopic rod 4 to the hinges 33. The outer wall of the clamps 31 has an arcuate groove and a clamping screw. The arcuate groove mates with a protrusion at the lower end of the prism rod 52. The protrusion can slide along the arcuate groove on the outer wall of the clamps 31 and is secured by the clamping screw, allowing the prism assembly 5 to be installed along the plumb line.

[0053] like Figure 4 As shown, the present application also provides a method for measuring the elevation of a suspension bridge anti-sway reference cable, comprising the following steps:

[0054] S1: After installing two bundles of auxiliary strands 2 and the reference strand 1, install a main clamp at the mid-span of the auxiliary strands 2 and the reference strand 1, and connect the main clamps using support rods 4;

[0055] S2: Install an auxiliary clamp on an auxiliary strand 2, and connect the auxiliary clamp to the strand clamp 3 on another auxiliary strand 2 and the strand clamp 3 on the reference strand 1 using a support rod 4;

[0056] S3: Measure the mid-span height difference between the reference cable strand 1 and the auxiliary cable strand 2 as the known mid-span height difference;

[0057] S4: Measure the actual mid-span elevations of the reference cable strand 1 and the auxiliary cable strand 2;

[0058] S5: Determine the accuracy of the actual mid-span elevation of the reference strand 1 based on the deviations between the actual mid-span elevation differences of the reference strand 1 and the two auxiliary strands 2 and the known mid-span elevation differences.

[0059] In step S1, connecting the main fixtures using support rods 4 can be completed in step S2. Installing the prism assembly 5 at the mid-span of the auxiliary strand 2 and the reference strand 1 can also be completed in step S2. There is no order in which steps S1 and S2 are installed. Support rods 4 can be installed on the strand fixture 3 first, followed by the strand fixture 3 being installed on the reference strand 1 and the auxiliary strand 2. Alternatively, the strand fixture 3 can be installed on the reference strand 1 and the auxiliary strand 2 first, followed by the support rods 4.

[0060] In this application, after the base strand 1 is installed, two bundles of auxiliary strands 2 are installed at a predetermined height from the base strand 1, forming an acute-angled triangle spacing relationship at the mid-span plumb cross-sections of the base strand 1 and the auxiliary strands 2. Three main strand clamps 3 are installed at the mid-span plumb cross-sections ABC of the base strand 1 and the two bundles of auxiliary strands 2, respectively. Another strand clamp 3 is installed near the mid-span plumb cross-section ABC of one of the two bundles of auxiliary strands 2. Each strand clamp 3 is secured to the base strand 1 and the auxiliary strand 2 using fixing screws 32.

[0061] In this embodiment, the support rods 4 are telescopic rods. The lengths of the five telescopic rods 4 are adjusted, and the hinged forks at one end of the slide rods 41 and the sleeves 42 are respectively connected to the hinge seats 33 of each clamp 31 of different cable strand clamps 3. The slide rods 41 and the sleeves 42 are tightened to the hinge seats 33 using the tightening pins on each hinge seat 33. The slide rods 41 and the sleeves 42 are locked with the fastening screws 43, thereby forming a stable cone body of the anti-sway reference cable elevation measurement device.

[0062] The three prism groups 5 are plumb installed on the main clamps of the reference cable strand 1 and the auxiliary cable strand 2 through the level bubble on the prism rod 52, and the protrusion at the lower end of the prism rod 52 is locked with the arc-shaped groove through the clamping screw on the arc-shaped groove on the outer wall of the clamp 31 to complete the installation of the anti-sway reference cable height measuring device.

[0063] In some optional embodiments, the support rod 4 has a known fixed length. In this case, it is only necessary to connect the hinge forks at both ends of the support rod 4 to the hinge seats 33 of the clamps 31 of different cable strand clamps 3, and then tighten the ends of the support rod 4 to the hinge seats 33 using the tightening pins on each hinge seat 33.

[0064] Step S3 specifically includes the following steps:

[0065] At the plumb bob cross section at the mid-span of the reference strand 1 and the auxiliary strand 2, use a level with a bidirectional inclinometer to measure the inclination angle and slant distance between the side edge at the center of the regular hexagon of the reference strand 1 and the side edge on the same side at the center of the regular hexagon of the two bundles of auxiliary strands 2. Based on the inclination angle and slant distance between the side edge at the center of the regular hexagon of the reference strand 1 and the side edge on the same side at the center of the regular hexagon of the two bundles of auxiliary strands 2, calculate the height difference ΔH between the center of the regular hexagon of the reference strand 1 and the center of the regular hexagon of the two bundles of auxiliary strands 2. AB and ΔH AC , as the known mid-span height difference between the reference strand 1 and the two auxiliary strands 2. It should be noted here that ΔH is calculated using the inclination angle and slope distance between the side edge at the center of the regular hexagon of the reference strand 1 and the side edge at the center of the regular hexagon of the two auxiliary strands 2. AB and ΔH AC ΔH is calculated using the inclination angle and slant distance between the center of the regular hexagon of the reference strand 1 and the centers of the regular hexagon of the two auxiliary strands 2. AB and ΔH AC , the two are equal.

[0066] Step S4 specifically includes the following steps:

[0067] The first total station 6 and the second total station 7 are respectively installed at two control points on both sides of the suspension bridge with known elevations and plane coordinates. The first total station 6 is adjusted to aim at a prism 51 in the prism group 5 on the reference cable strand 1 to obtain the measured elevation of the prism 51.

[0068] Adjust the second total station 7 to sight the other prism 51 in the prism set 5, and observe and obtain the measured elevation of the other prism 51;

[0069] The average of the measured elevations of the two prisms 51 in the prism group 5 is used as the measured elevation value of the reference cable 1. Based on the measured elevation of the prism group 5 at point A, the differential elevation of the prism group 5 at point A is obtained.

[0070] Similarly, the measured elevation values ​​of the prism group 5 on the auxiliary strand 2 are measured in sequence according to the above method, and the differential elevations of the prism group 5 at point B and the prism group 5 at point C are obtained based on the measured elevations of the prism group 5 at point B and the prism group 5 at point C.

[0071] Based on the differential elevations of the prism groups 5 at points A, B, and C and the heights of each prism group 5 to the center of the regular hexagon of the corresponding reference strand 1 or auxiliary strand 2, the actual mid-span elevations of the reference strand 1 and the two bundles of auxiliary strands 2 at their mid-span plumb bob cross section ABC are calculated.

[0072] By obtaining the actual measured values ​​of the elevations of the multiple prisms 51 on the prism group 5 and then calculating the average, the measurement error of the actual measured elevations of the prism group 5 is reduced by the average observation method, the error of a single measurement is reduced, and the measurement accuracy is improved.

[0073] Step S5 specifically includes the following steps:

[0074] Calculate the actual mid-span height difference ΔH' between the base strand 1 and the two auxiliary strands 2 based on their actual mid-span plumb bob cross sections. AB and ΔH' AC , compare the deviation between the actual mid-span height difference and the known mid-span height difference:

[0075] Δ AB =ΔH' AB -ΔH AB ;

[0076] Δ AC =ΔH' AC -ΔH AC ;

[0077] If the deviation between the actual mid-span height difference between the reference cable strand 1 and the two auxiliary cable strands 2 and the known mid-span height difference exceeds the allowable deviation, repeat the above steps until the difference is less than the allowable deviation. The actual measured elevation value at this time is used as the mid-span elevation of the reference cable strand 1.

[0078] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0079] (1) The purpose of the present invention is to provide a suspension bridge anti-sway reference cable elevation measurement device, which relies on the reference cable strand and two bundles of auxiliary cable strands set up at a certain height. After adjusting the length of five telescopic rods, their respective hinge forks are connected to the hinge seats of the clamps of the four cable strand clamps respectively. The telescopic rods are tightened to the hinge seats by tightening pins on the hinge seats respectively, and the sliding rods and sleeves of the telescopic rods are locked by fastening screws 43 respectively, together forming a stable anti-sway reference cable elevation measurement device geometry, effectively reducing the sway of the reference cable strand, which is conducive to ensuring the accuracy of the reference cable strand elevation measurement during sway, adapting to the marine environment, and having high measurement accuracy.

[0080] (2) The present invention aims to provide a method for measuring the elevation of a suspension bridge anti-sway reference cable. By constructing a known geometric elevation difference relationship between the points of △ABC, the accuracy of the actual elevation of point A of the reference cable during sway is determined based on whether the deviation between the actual elevation difference relationship of points A, B, and C and their known geometric elevation difference relationship is less than a threshold. When the deviation is less than the threshold, point A can be averaged and corrected (the average value is taken to obtain the correction value of point A) based on the deviation between the actual elevation difference relationship of points A, B, and C and their known geometric elevation difference relationship. The actual elevation of point A can then be corrected using the correction value of point A, thereby further improving the accuracy of the elevation measurement of point A.

[0081] (3) The purpose of the present invention is to provide a device and method for measuring the elevation of a suspension bridge anti-sway reference cable. The auxiliary cable strands installed in advance are general cable strands that need to be installed during construction. The advance installation of the auxiliary cable strands does not affect the construction of the general cable strands and is beneficial to the elevation measurement of the reference cable strands.

[0082] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0083] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0084] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. Anti-sway reference cable height measurement device for suspension bridge, characterized in that: It includes: two auxiliary strands (2); A fixture group, comprising a plurality of cable strand fixtures (3), wherein three of the cable strand fixtures (3) are main fixtures for being respectively installed on the mid-span of a reference cable strand (1) and two auxiliary cable strands (2), a prism group (5) being provided on a plumb bob on the main fixture, and at least one of the cable strand fixtures (3) is an auxiliary fixture for being installed on an auxiliary cable strand (2); A plurality of support rods (4), wherein a strand clamp (3) on one auxiliary strand (2) is connected to a strand clamp (3) on another auxiliary strand (2) via a support rod (4), and the strand clamp (3) on the auxiliary strand (2) is further provided with a support rod (4) for connecting to the strand clamp (3) on the reference strand (1); and a total station.

2. The suspension bridge anti-sway reference cable elevation measurement device according to claim 1, characterized in that: The support rod (4) is a telescopic rod; The device also includes an inclinometer and a level.

3. The suspension bridge anti-sway reference cable elevation measurement device according to claim 2, characterized in that: The prism group (5) comprises two prisms (51) and a prism rod (52); the two prisms (51) are arranged opposite to each other and fixedly mounted on one end of the prism rod (52); a center line connecting the two prisms (51) is perpendicular to the prism rod (52); and a level bubble is provided on the prism rod (52).

4. The suspension bridge anti-sway reference cable elevation measurement device according to claim 2, characterized in that: The cable strand clamp (3) comprises at least two clamps (31) and a fastener. After the clamps (31) are connected by the fastener, the inner hole formed by the clamps (31) has the same cross-sectional shape and size as the reference cable strand (1) or the auxiliary cable strand (2).

5. The suspension bridge anti-sway reference cable elevation measurement device according to claim 4, characterized in that: The telescopic rod (4) comprises a sliding rod (41) and a sleeve (42) that are slidably connected. The sleeve (42) is rotatably connected to a fastener at one end close to the sliding rod (41) so that the sliding rod (41) and the sleeve (42) are fixedly connected. The sliding rod (41) and the sleeve (42) on the same telescopic rod (4) are respectively hinged to the clamps (31) on different cable strand clamps (3) at one end away from each other.

6. A method for measuring the elevation of a suspension bridge anti-sway reference cable, comprising the apparatus for measuring the elevation of a suspension bridge anti-sway reference cable according to any one of claims 1 to 5, characterized in that: The steps include: After installing the auxiliary cable strands (2) and the reference cable strands (1), a main fixture and a prism assembly (5) are installed at the mid-span of the auxiliary cable strands (2) and the reference cable strands (1), and the main fixtures are connected using support rods (4); An auxiliary clamp is installed on an auxiliary cable strand (2), and the auxiliary clamp is connected to a cable strand clamp (3) on another auxiliary cable strand (2) and a cable strand clamp (3) on a reference cable strand (1) using a support rod (4); Measuring the mid-span height difference between the reference cable strand (1) and the auxiliary cable strand (2) as the known mid-span height difference; Measure the actual mid-span elevations of the reference cable strand (1) and the auxiliary cable strand (2); The accuracy of the actual mid-span elevation of the reference cable strand (1) is determined based on the deviation between the actual mid-span elevation difference of the reference cable strand (1) and the two bundles of auxiliary cable strands (2) and the known mid-span elevation difference.

7. The method for measuring the elevation of a suspension bridge anti-sway reference cable according to claim 6, wherein: The measuring of the mid-span height difference between the reference cable strand (1) and the auxiliary cable strand (2) as the known mid-span height difference comprises the following steps: On the mid-span plumb bob cross sections of the reference cable strand (1) and the auxiliary cable strand (2), a level with a bidirectional inclinometer is used to measure the height difference between the reference cable strand (1) and the two bundles of auxiliary cable strands (2) respectively, which is used as the known mid-span height difference between the reference cable strand (1) and the two bundles of auxiliary cable strands (2).

8. The method for measuring the elevation of a suspension bridge anti-sway reference cable according to claim 6, wherein: The measuring of the actual mid-span elevation of each of the reference cable strand (1) and the auxiliary cable strand (2) comprises the following steps: Two total stations (7) are respectively installed at two control points with known elevations and plane coordinates on both sides of the suspension bridge; The differential elevations of the prism groups (5) are measured respectively by total stations (7) on both sides of the strait. Based on the differential elevations of the three prism groups (5) and the lengths of the prism rods (52), the actual elevations of the reference cable strand (1) and the two auxiliary cable strands (2) at the plumb bob cross section at their mid-span are calculated.

9. The method for measuring the elevation of a suspension bridge anti-sway reference cable according to claim 6, wherein: According to the deviation between the actual mid-span height difference of the reference cable strand (1) and the two auxiliary cable strands (2) and the known mid-span height difference, the accuracy of the actual mid-span height difference of the reference cable strand (1) is determined, which includes the following steps: According to the actual elevations of the reference cable strand (1) and the two auxiliary cable strands (2) at the plumb bob cross section at their mid-span, the actual mid-span height difference of the reference cable strand (1) and the auxiliary cable strand (2) is calculated, and the deviation of the actual mid-span height difference is compared with the known mid-span height difference; If the deviation between the actual mid-span height difference of the reference cable strand (1) and the two auxiliary cable strands (2) and the known mid-span height difference exceeds the allowable deviation, repeat the above steps until the difference is less than the allowable deviation, and use the actual measured value of the elevation as the mid-span elevation of the reference cable strand (1).

10. The method for measuring the elevation of a suspension bridge anti-sway reference cable according to claim 8, wherein: Measuring the differential elevation of each prism group (5) using the total stations (7) on both sides of the prism group (5) includes: measuring the measured elevation of each prism (51) in the prism group (5), taking the average value of the measured elevations of each prism (51) as the measured elevation value, and obtaining the differential elevation of the prism group (51) based on the measured elevation value.

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