Auxiliary device and method for measuring length of central fastening cable of newly-built suspension bridge

Abstract

The application discloses an auxiliary device and a measuring method for the length of a central fastener cable of a newly-built suspension bridge. The auxiliary device comprises a shell, a prism adapter, top blocks and a synchronous mechanism. The number of the top blocks is at least three, and the top blocks are arranged on the same side of the shell and are distributed in a circular array with the axis of the shell as the center. The prism adapter is installed on the side of the shell away from the top blocks, and the prism adapter is located on the axis of the shell and is perpendicular to the shell. The synchronous mechanism is connected with the top blocks and is used for driving the top blocks to move synchronously towards or away from the axis of the shell. The auxiliary device and the measuring method for the length of the central fastener cable of the newly-built suspension bridge. The auxiliary device is driven by the synchronous mechanism to move synchronously, and can adapt to different sizes of the lug aperture. The positions of the top blocks and the prism adapter are set, so that the auxiliary device has a self-centering function, the center line of the device is the same as the center line of the lug, and the operation difficulty during the measurement is reduced.

Description

Technical Field

[0001] This invention relates to an auxiliary device and a method for measuring the length of the central cable of a newly constructed suspension bridge, belonging to the field of bridge engineering monitoring technology. Background Technology

[0002] In classic suspension bridge structures, the vertical arrangement of the cables fails to provide effective longitudinal restraint between the main cable and the stiffening girder. The longitudinal relative displacement between the main cable and the main girder causes excessive bending stress in the cables, leading to premature fatigue failure in short cables. To limit the relative longitudinal movement between the main cable and the stiffening girder, a central tie cable was first used on the new Tacoma Narrows Bridge in 1950. However, the central tie cable for newly constructed suspension bridges is often cut and installed after the completion of the second phase of construction, resulting in the following defects in the measurement of its length:

[0003] (1) The operation is difficult and the efficiency is low. It is difficult to locate the center point of the cable clamp central buckle ear hole and the stiffening beam central buckle ear hole. When measuring with a steel tape measure, the position of the steel tape measure through the mesh hole is affected by the catwalk paving mesh, and the steel tape measure needs to be adjusted many times to ensure that the steel tape measure is kept straight during measurement.

[0004] (2) High labor costs. Existing measurement methods are not suitable for single-person operation and require multiple people to cooperate to complete the measurement.

[0005] (3) Low measurement accuracy. The positioning deviation of the center point of the lifting lug hole and the low accuracy of measuring instruments such as steel tape measures. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an auxiliary device and a method for measuring the length of the central cable of a newly built suspension bridge. The auxiliary device drives the top block to move synchronously through a synchronization mechanism, which can adapt to different sizes of lug apertures. The position setting of the top block and prism adapter enables the auxiliary device to have a self-centering function, and the center line of the device is the same as the center line of the lug, so as to reduce the difficulty of operation during measurement.

[0007] To achieve the above objectives / to solve the above technical problems, the present invention is implemented using the following technical solution:

[0008] In a first aspect, the present invention provides an auxiliary device, comprising a housing, a prism adapter, a top block, and a synchronization mechanism, wherein...

[0009] The number of top blocks is at least three, which are arranged on the same side of the shell and distributed in a circular array with the axis of the shell as the center;

[0010] The prism adapter is installed on the side of the housing away from the top block, and the prism adapter is located at the axis of the housing and perpendicular to the outer shell;

[0011] The synchronization mechanism is connected to the top block and is used to drive multiple top blocks to move synchronously toward or away from the housing axis.

[0012] Furthermore, the synchronization mechanism includes a coil, a slide rail, and a bevel gear, wherein,

[0013] The coil is rotatably installed inside the housing, with an Archimedean spiral groove on one side facing the top block and a fan-shaped tooth on the other side;

[0014] The number of slides is the same as that of the top block, and the slides are located on the straight line connecting the top block and the housing axis. One side of the slide is provided with mating teeth for engaging with the Archimedes spiral groove, and the other side is provided with a connecting hole for installing the top block. The housing is provided with a groove at the slide for the slide to enter and exit.

[0015] One end of the bevel gear meshes with the fan-shaped teeth of the coil, and the other end penetrates the inner wall of the housing and extends to the outside of the housing where an adjustment block is fixed.

[0016] Furthermore, each of the slides has at least two connecting holes.

[0017] Furthermore, the top block is connected to the connecting hole on the slide by bolts.

[0018] Furthermore, the side of the slide away from the coil contacts the inner wall of the housing.

[0019] Furthermore, the end of the adjusting block away from the bevel gear has an internal hexagonal hole.

[0020] Secondly, the present invention provides a method for measuring the length of the central cable of a newly constructed suspension bridge, based on the auxiliary device described in the first aspect, wherein the number of auxiliary devices is four, and the method includes:

[0021] Select the appropriate connection hole to install the top block according to the size of the lifting lug hole on site;

[0022] Insert the top block into the lifting lug hole so that the shell is in close contact with the side of the lifting lug in the center of the cable clamp;

[0023] Insert the Allen wrench into the Allen hole and rotate the bevel gear with the Allen wrench. The bevel gear rotates the coiled screw, and the coiled screw causes each slide and top block to slide outward by the same distance until the three top blocks are completely pressed against the inner wall of the lifting lug hole.

[0024] Insert the circular prism into the prism adapter;

[0025] Repeat the above steps until the remaining three devices are installed into the lug holes of the remaining three measuring points;

[0026] The three-dimensional coordinates of measuring points one through four are measured using a high-precision measuring robot. Measuring points one (X1, Y1, Z1), two (X2, Y2, Z2), three (X3, Y3, Z3), and four (X4, Y4, Z4) are used. The length L of the central cable is calculated using the following formula:

[0027]

[0028] Furthermore, the method for selecting the measuring points includes:

[0029] The measuring point one and measuring point two are located on both sides of the central buckle cable connection hole of the cable clamp. The line connecting measuring point one and measuring point two passes through the center of the central buckle cable connection hole of the cable clamp and is the same distance from the center.

[0030] The measuring points three and four are located on both sides of the cable connection hole in the center of the stiffening beam ear plate. The line connecting the measuring points three and four passes through the center of the cable connection hole in the center of the stiffening beam ear plate and is equidistant from the center.

[0031] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0032] This auxiliary device drives the top block to move synchronously through a synchronization mechanism, which can adapt to different sizes of lifting lug apertures. The position setting of the top block and prism adapter enables the auxiliary device to have a self-centering function, with the center line of the device being the same as the center line of the lifting lug, thereby reducing the difficulty of operation during measurement.

[0033] The method for measuring the length of the central cable of the newly built suspension bridge, by adapting to the aforementioned auxiliary device, is not affected by the construction catwalk and on-site operations, and can be completed by a single person, thus achieving rapid measurement of the length of the central cable. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the auxiliary device provided in Embodiment 1;

[0035] Figure 2 yes Figure 1 A schematic cross-sectional view of the auxiliary device shown.

[0036] Figure 3 yes Figure 1 A schematic diagram of the structure of the surface where the top block of the auxiliary device is located;

[0037] Figure 4 This is a schematic diagram of the structure of the coiled wire.

[0038] Figure 5 This is a schematic diagram of the slide structure;

[0039] Figure 6 This is a schematic diagram of the bevel gear structure;

[0040] Figure 7 This is an application scenario diagram of the method for measuring the length of the central cable of a newly built suspension bridge provided in Example 2;

[0041] Figure 8 yes Figure 7 Enlarged schematic diagram of the structure at point A;

[0042] Figure 9 yes Figure 7 An enlarged schematic diagram of the structure at point B in the middle.

[0043] In the diagram: 1. Housing; 2. Bevel gear; 21. Internal hexagonal hole; 3. Threaded screw; 31. Archimedes spiral groove; 32. Sector tooth; 4. Slide rail; 41. First connecting hole; 42. Second connecting hole; 5. Prism adapter; 6. Top block; 7. Back cover. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Example 1:

[0048] like Figures 1-6 As shown, this embodiment provides an auxiliary device, including a housing 1, a prism adapter 5, a top block 6, and a synchronization mechanism, wherein...

[0049] The number of top blocks 6 is at least three, which are arranged on the same side of the housing 1 and distributed in a circular array with the axis of the housing 1 as the center;

[0050] The prism adapter 5 is installed on the side of the housing 1 away from the top block 6, and the prism adapter 5 is located at the axis of the housing 1 and perpendicular to the outer shell;

[0051] The synchronization mechanism is connected to the top block 6 and is used to drive multiple top blocks 6 to move synchronously toward or away from the axis of the housing 1.

[0052] In the above technical solution, the top block 6 is driven to move synchronously by the synchronization mechanism, which can adapt to different sizes of lifting lug diameters. The position setting of the top block 6 and the prism adapter 5 enables the auxiliary device to have a self-centering function, and the center line of the device is the same as the center line of the lifting lug, so as to reduce the difficulty of operation during measurement.

[0053] To enable the top block 6 to move synchronously under the action of the synchronization mechanism, the synchronization mechanism includes a coil 3, a slide rail 4, and a bevel gear 2, wherein,

[0054] The coiled wire 3 is rotatably installed inside the housing 1. The side of the coiled wire 3 facing the top block 6 has an Archimedean spiral groove 31, and the other side has a fan-shaped tooth 32.

[0055] The number of slides 4 is the same as that of the top block 6, and the slides 4 are located on the straight line connecting the top block 6 and the axis of the housing 1. One side of the slide is provided with a mating tooth for engaging with the Archimedes spiral groove 31, and the other side is provided with a connecting hole for installing the top block 6. The housing 1 is provided with a groove at the slide 4 for the slide 4 to enter and exit.

[0056] One end of the bevel gear 2 meshes with the sector teeth 32 of the coiled wire 3, and the other end penetrates the inner wall of the housing 1 and extends to the outside of the housing 1 where an adjustment block is fixed.

[0057] To meet the tightening requirements of different specifications of lifting lug holes, each slide rail 4 has at least two connecting holes. In this embodiment, each slide rail 4 has two connecting holes, namely a first connecting hole 41 and a second connecting hole 42.

[0058] To achieve the connection between the top block 6 and the slide rail 4, the top block 6 is connected to the connection hole on the slide rail 4 by bolts.

[0059] To ensure the stability of the slide 4 during movement, the side of the slide 4 away from the coil 3 is in contact with the inner wall of the housing 1.

[0060] To facilitate adjustment of the bevel gear 2, an internal hexagonal hole 21 is provided at the end of the adjustment block away from the bevel gear 2.

[0061] In the above technical solution, the bevel gear 2, the coiled screw 3, and the slide rail 4 are installed inside the housing 1, the rear cover 7 can fit tightly, and the bevel gear 2 rotates flexibly. The bevel gear 2 and the sector tooth 32 make smooth contact and rotate flexibly. The Archimedes spiral groove 31 makes smooth contact and rotates flexibly with the slide rail 4. The slide rail 4 and the top block 6 can be selected according to the size of the lifting lug hole on site, and are fixed by connecting bolts 61. The prism adapter 5 is located at the center of the housing 1 and is perpendicular to the housing 1.

[0062] In summary, the auxiliary device provided in this embodiment, with its Archimedes spiral groove 31 in the coil 3, ensures that the sliding distance of each slide 4 is the same, thus playing a self-centering role. It can adapt to different sizes of lifting lug apertures, and the auxiliary device has a self-centering function, with its center line aligned with the lifting lug center line, reducing the operational difficulty during measurement.

[0063] Example 2:

[0064] like Figure 7 As shown, this embodiment provides a method for measuring the length of the central cable of a newly constructed suspension bridge. Based on the auxiliary device described in Embodiment 1, the method comprises four auxiliary devices and includes:

[0065] Select the appropriate connection hole to install the top block 6 according to the size of the lifting lug hole on site;

[0066] Insert the top block 6 into the lifting lug hole so that the outer shell 1 is in close contact with the side of the central cable clamp lifting lug;

[0067] Insert the Allen wrench into the Allen hole 21, and rotate the bevel gear 2 by the Allen wrench. The bevel gear 2 rotates the coil 3, and the coil 3 causes each slide 4 and top block 6 to slide outward by the same distance until the three top blocks 6 are completely pressed against the inner wall of the lifting lug hole.

[0068] Insert the circular prism into prism adapter 5;

[0069] Repeat the above steps until the remaining three devices are installed into the lug holes of the remaining three measuring points;

[0070] The three-dimensional coordinates of measuring points one through four are measured using a high-precision measuring robot. Measuring points one (X1, Y1, Z1), two (X2, Y2, Z2), three (X3, Y3, Z3), and four (X4, Y4, Z4) are used. The length L of the central cable is calculated using the following formula:

[0071]

[0072] In this embodiment, the method for selecting the measuring points includes:

[0073] like Figures 7-9 As shown in the figure, the structures corresponding to each mark are: 10, main cable; 11, cable clamp; 12, central fastening cable lug; 13, stiffening beam; 14, central fastening cable; 15, circular prism; 100, auxiliary device.

[0074] The measuring point one and measuring point two are located on both sides of the central buckle cable connection hole of the cable clamp. The line connecting measuring point one and measuring point two passes through the center of the central buckle cable connection hole of the cable clamp and is the same distance from the center.

[0075] The measuring points three and four are located on both sides of the cable connection hole in the center of the stiffening beam ear plate. The line connecting the measuring points three and four passes through the center of the cable connection hole in the center of the stiffening beam ear plate and is equidistant from the center.

[0076] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An auxiliary device, characterized in that, It includes a housing (1), a prism adapter (5), a top block (6), and a synchronization mechanism, wherein, The number of top blocks (6) is at least three, which are arranged on the same side of the shell (1) and distributed in a circular array with the axis of the shell (1) as the center; The prism adapter (5) is installed on the side of the housing (1) away from the top block (6), and the prism adapter (5) is located at the axis of the housing (1) and perpendicular to the outer shell; The synchronization mechanism is connected to the top block (6) and is used to drive multiple top blocks (6) to move synchronously toward or away from the axis of the housing (1); The synchronization mechanism includes a coil (3), a slide rail (4), and a bevel gear (2), wherein, The coil (3) is rotatably installed inside the housing (1). The side of the coil (3) facing the top block (6) is an Archimedes spiral groove (31), and the other side is a fan-shaped tooth (32). The number of slides (4) is the same as that of the top block (6), and the slides (4) are located on the straight line connecting the top block (6) and the axis of the housing (1). One side of the slide (4) is provided with a mating tooth for engaging with the Archimedes spiral groove (31), and the other side is provided with a connecting hole for installing the top block (6). The housing (1) is provided with a groove at the slide (4) for the slide (4) to enter and exit. One end of the bevel gear (2) meshes with the sector teeth (32) of the coil (3), and the other end penetrates the inner wall of the housing (1) and extends to the outside of the housing (1) where an adjustment block is fixed. The top block (6) is connected to the connecting hole on the slide (4) by bolts.

2. The auxiliary device according to claim 1, characterized in that, The number of connecting holes on each of the slides (4) is at least two.

3. The auxiliary device according to claim 1, characterized in that, The side of the slide (4) away from the coil (3) is in contact with the inner wall of the shell (1).

4. The auxiliary device according to claim 1, characterized in that, The adjusting block has an internal hexagonal hole (21) at the end away from the bevel gear.

5. A method for measuring the length of the central cable of a newly constructed suspension bridge, based on the auxiliary device described in any one of claims 1-4, characterized in that, The number of auxiliary devices is four, and the method includes: Select the appropriate connection hole to install the top block (6) according to the size of the lifting lug hole on site. Insert the top block (6) into the lifting lug hole so that the shell (1) is in close contact with the side of the lifting lug of the cable clamp in the center; Insert the Allen wrench into the Allen hole (21), and rotate the bevel gear (2) with the Allen wrench. The bevel gear (2) rotates with the coil (3). The coil (3) causes each slide (4) and top block (6) to slide outward by the same distance until the three top blocks (6) are completely pressed against the inner wall of the lifting lug hole. Insert the circular prism into the prism adapter (5); Repeat the above steps until the remaining three devices are installed into the lug holes of the remaining three measuring points; Measure the three-dimensional coordinates of measuring points 1 through 4, where measuring point 1 is (X1, Y1, Z1), measuring point 2 is (X2, Y2, Z2), measuring point 3 is (X3, Y3, Z3), and measuring point 4 is (X4, Y4, Z4). Calculate the length L of the central cable using the following formula: 。 6. The method for measuring the length of the central cable of a newly constructed suspension bridge according to claim 5, characterized in that, The method for selecting the measuring points includes: The measuring point one and measuring point two are located on both sides of the central buckle cable connection hole of the cable clamp. The line connecting measuring point one and measuring point two passes through the center of the central buckle cable connection hole of the cable clamp and is the same distance from the center. The measuring points three and four are located on both sides of the cable connection hole in the center of the stiffening beam ear plate. The line connecting the measuring points three and four passes through the center of the cable connection hole in the center of the stiffening beam ear plate and is equidistant from the center.

Images