Auxiliary tensioning device for suspension bridge cable clamp screw

Abstract

The utility model relates to the technical field of bridge construction, and discloses a suspension bridge cable clamp screw rod auxiliary tensioning device which comprises a hydraulic jack, an auxiliary tightening device, a lower rotating sleeve, an upper rotating sleeve, a static scale device, a screw rod, a nut, a cable clamp and an ultrasonic longitudinal wave measuring instrument. The lower rotating sleeve comprises a sleeve inner wall, a sleeve outer wall, a lower permanent magnet ring, a sliding rail and a limiting groove. The problem that it is difficult to accurately and quantitatively control the actual internal force value of the screw during screw tensioning can be solved by controlling the screwing angle of the suspension bridge cable clamp nut, and the device is convenient to mount and dismount, simple in use method, good in durability and applicability and capable of being repeatedly used in different construction environments.

Description

Technical Field

[0001] This application belongs to the technical field of bridge construction, and particularly relates to an auxiliary tensioning device for the cable clip screw of a suspension bridge. Background Technique

[0002] A suspension bridge is a common type of bridge in bridge engineering. Among them, the cable clip is an important component connecting the main cable and the bridge deck system. During the installation and maintenance of the cable clip, it is necessary to tighten the cable clip screw nut. Traditional tightening methods mostly rely on manual labor, which not only has a large labor intensity, but also it is difficult to precisely control the tightening force and angle, easily affecting the final axial force of the screw, the fastening effect of the cable clip, and the safety performance of the bridge.

[0003] Most of the existing cable clip screw nut tightening devices on the market and the nut tightening methods used on site have the following problems: First, the tightening force is uncontrollable, and if the nut is too loose, it is easy to cause a serious loss of the pre-tightening force of the screw; second, it is impossible to accurately control the tightening force value, and the tightening efficiency is low. Utility Model Content

[0004] The purpose of this utility model is to solve the above problems, and an auxiliary tensioning device for the cable clip screw of a suspension bridge is proposed.

[0005] In order to achieve the above purpose, this application adopts the following technical solutions:

[0006] An auxiliary tensioning device for the cable clip screw of a suspension bridge, including a hydraulic jack, an auxiliary tightening device, a lower rotating sleeve, an upper rotating sleeve, a static scale device, a screw, a nut, a cable clip, and an ultrasonic longitudinal wave measuring instrument. The lower rotating sleeve includes a sleeve inner wall, a sleeve outer wall, a lower permanent magnet ring, a slide rail, and a limiting groove;

[0007] The upper rotating sleeve includes a sleeve main body, a slider, and a pointer;

[0008] The static scale device includes an upper permanent magnet ring and an angle scale.

[0009] Preferably, the lower rotating sleeve passes through the screw and the hydraulic jack, and directly adsorbs on the upper surface of the nut by relying on the lower permanent magnet ring, and rotates synchronously when the nut is tightened.

[0010] Preferably, the bottom of the slide rail is designed with a limiting groove to prevent the lower rotating sleeve and the upper rotating sleeve from being too difficult to disassemble due to excessive contraction.

[0011] Preferably, the upper rotating sleeve is connected to the slide rail of the lower rotating sleeve through a slider to achieve any telescopic function and adapt to different types of screws with different lengths.

[0012] Preferably, the pointer installed on the upper rotating sleeve is of the magnetic buckle type, and the bottom of the pointer and the magnetic buckle adsorption surface should be arcs with the same diameter as the cross-section of the main body of the upper rotating sleeve.

[0013] Preferably, the stationary scale device is directly adsorbed on the upper surface of the hydraulic jack through the upper permanent magnet ring and remains relatively stationary with the hydraulic jack.

[0014] Preferably, the lower permanent magnet ring and the upper permanent magnet ring are designed to have adjustable angles or curvatures.

[0015] Compared with the prior art, the present application provides a cable clip screw auxiliary tensioning device for a suspension bridge, which has the following beneficial effects:

[0016] 1. For this cable clip screw auxiliary tensioning device of the suspension bridge, accurate control of the screw axial force can be achieved by tensioning with a hydraulic jack, measuring with an ultrasonic longitudinal wave method instrument, and determining the nut angle with the auxiliary tensioning device. It is basically consistent with the construction process of the existing cable clip screw tensioning of the suspension bridge, which is convenient for on-site workers to directly learn and apply.

[0017] 2. This cable clip screw auxiliary tensioning device of the suspension bridge has no complex mechanical and transmission structures, does not require energy supply and complex operations, and can be matched with the jack used in construction, which is convenient for on-site installation and use.

[0018] 3. After the screw tensioning is completed, this cable clip screw auxiliary tensioning device of the suspension bridge is convenient to disassemble, can be recycled, and has good applicability to the construction environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a cable clip screw auxiliary tensioning device for a suspension bridge proposed by the present application;

[0020] Figure 2 It is a schematic structural diagram of the lower rotating sleeve of a cable clip screw auxiliary tensioning device for a suspension bridge proposed by the present application;

[0021] Figure 3 It is a schematic structural diagram of the upper rotating sleeve of a cable clip screw auxiliary tensioning device for a suspension bridge proposed by the present application;

[0022] Figure 4 It is a schematic structural diagram of the stationary scale device of a cable clip screw auxiliary tensioning device for a suspension bridge proposed by the present application;

[0023] Figure 5 It is a schematic diagram of the installation effect of a cable clip screw auxiliary tensioning device for a suspension bridge proposed by the present application.

[0024] In the figure: 1. Hydraulic jack; 2. Auxiliary tightening device; 21. Lower rotating sleeve; 211. Inner wall of the sleeve; 212. Outer wall of the sleeve; 213. Lower permanent magnet ring; 214. Slide rail; 215. Limit groove; 22. Upper rotating sleeve; 221. Sleeve body; 222. Slide block; 223. Pointer; 23. Static scale device; 231. Upper permanent magnet ring; 232. Angle scale; 3. Screw; 4. Nut; 5. Cable clamp; 6. Ultrasonic longitudinal wave measuring instrument; 61. Temperature compensation probe; 62. Ultrasonic transducer. Specific embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0026] Refer to Figures 1-5 , an auxiliary tensioning device for the cable clamp screw of a suspension bridge, including a lower rotating sleeve 21, which is directly adsorbed on the nut 4 by a lower permanent magnet and rotates when the nut 4 is tightened.

[0027] An upper rotating sleeve 22, which is arranged above the lower rotating sleeve 21 and is connected by a slide rail 214 to achieve the functions of synchronous rotation and telescoping.

[0028] A static scale device 23, which is directly adsorbed on the hydraulic jack 1 by an upper permanent magnet, and the upper surface is engraved with an angle scale 232, and works in cooperation with the pointer 223 of the upper rotating sleeve 22.

[0029] The slide rail 214 and the slide block 222 are respectively arranged inside the lower rotating sleeve 21 and the upper rotating sleeve 22, used to connect the two parts of the device, and have the functions of limiting and telescoping.

[0030] The pointer 223 is arranged at the top of the upper rotating sleeve 22, has an obvious mark, and jointly displays the tightening angle of the nut 4 in cooperation with the static scale device 23.

[0031] The pointer 223 can be made of a magnetic metal material, such as iron-nickel alloy, and is adsorbed on the upper rotating sleeve 22 by a magnetic buckle at the bottom, and can be installed and disassembled arbitrarily.

[0032] The limit groove 215 is arranged at the bottom of the slide rail 214 of the lower rotating sleeve 21 to prevent the lower rotating sleeve 21 and the upper rotating sleeve 22 from shrinking too much and being difficult to disassemble, and it is easy to damage the pointer.

[0033] The operating principle of the present utility model is described as follows:

[0034] When this application is in use, before tensioning, an ultrasonic longitudinal wave instrument is used to measure the ultrasonic travel time of the screw rod 3 in the zero-stress state. It is necessary to determine the ultrasonic travel time of the screw rod 3 of each cable clip 5 to be tensioned in the zero-stress state, and use this value as the benchmark for the axial force value obtained from the tension measurement of the screw rod 3, so as to eliminate the influence of the manufacturing tolerance of the screw rod 3 on the measurement data. Install the hydraulic jack 1 and the auxiliary tensioning device for the screw rod 3. The lower rotating sleeve 21 passes through the screw rod 3 and is adsorbed on the nut 4 by relying on the lower permanent magnet ring 213. Install the hydraulic jack 1 through the screw rod 3 and the lower rotating sleeve 21. Install the static scale device 23, which is adsorbed on the jack by relying on the upper permanent magnet ring 231. Install the upper rotating sleeve 22 so that the slider 222 is installed corresponding to the lower sleeve slide rail 214. Install the pointer 223, place the magnetic buckle inside the upper rotating sleeve 22 to adsorb the pointer 223, and make the angle pointed by the pointer 223 zero. Take the designed tensile force Fn of the screw rod 3 as the control oil pressure of the hydraulic jack 1 to perform the first tensioning on the screw rod 3. The first tensioning of the screw rod 3 of the cable clip 5 can be understood as the initial tensioning of the screw rod 3 of the test cable clip 5, and it is necessary to calculate the axial force and the tightening angle of the nut 4 for the second tensioning of the screw rod 3. Take the designed tensile force Fn as the control oil pressure of the jack to perform the first tensioning on the screw rod 3. After the jack is unloaded, use an ultrasonic longitudinal wave instrument to measure the internal force Fa of the screw rod 3, calculate the differential force value △F = Fn - Fa, calculate the corresponding relationship between the tightening angle θ of the nut and the axial force value of the screw rod 3 according to the parameters such as the material and cross-sectional size of the screw rod 3, obtain the slope k, and calculate the angle θ = k·△F that the nut 4 needs to be tightened. Control the jack to perform the second tensioning with the designed tensile force Fn + △F of the screw rod 3. After the tensioning is in place, use a lever to tighten the nut 4, and at the same time use the auxiliary tensioning device of the screw rod 3 to control the tightening angle to ensure that this angle is consistent with the calculated value θ. When using the lever to tighten the nut 4, the lower rotating sleeve 21 will rotate with the nut 4, and the static scale device 23 is stationary relative to the jack. It is necessary to observe the angle value of the rotation of the pointer 223 and control this value to be consistent with the calculated angle value θ. Perform ultrasonic longitudinal wave method detection on the screw rod 3 after the nut 4 is tightened and anchored to obtain the internal force value Fb of the screw rod 3 after tensioning and anchoring, and judge whether the internal force Fb of the screw rod 3 meets the design requirements. If so, the tensioning of the screw rod 3 is completed.

[0035] The above is only a preferred specific embodiment of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application, according to the technical solution of this application and its application concept, makes equivalent substitutions or changes, and all should be covered by the protection scope of this application.

Claims

1. A cable clamp screw auxiliary tensioning device for a suspension bridge, comprising a hydraulic jack (1), an auxiliary tightening device (2), a lower rotating sleeve (21), an upper rotating sleeve (22), a stationary scale device (23), a screw (3), a nut (4), a cable clamp (5), and an ultrasonic longitudinal wave measuring instrument (6), characterized in that: The lower rotating sleeve (21) comprises a sleeve inner wall (211), a sleeve outer wall (212), a lower permanent magnet ring (213), a slide rail (214), and a limiting groove (215); The upper rotating sleeve (22) comprises a sleeve body (221), a slider (222), and a pointer (223); The stationary scale device (23) comprises an upper permanent magnet ring (231) and an angle scale (232); The lower rotating sleeve (21) passes through the screw rod (3) and the hydraulic jack (1) and is directly adsorbed on the upper surface of the nut (4) by means of the lower permanent magnet ring (213); A limiting groove (215) is designed at the bottom of the slide rail (214) to prevent the lower rotating sleeve (21) and the upper rotating sleeve (22) from over-contracting and becoming difficult to disassemble; The upper rotating sleeve (22) is connected to the slide rail (214) of the lower rotating sleeve (21) via a sliding block (222); The pointer (223) installed on the upper rotating sleeve (22) is of a magnetic buckle type, and the bottom of the pointer (223) and the magnetic buckle adsorption surface need to be an arc with the same diameter as the cross-section of the main body of the upper rotating sleeve (22); The static scale device (23) is directly adsorbed on the upper surface of the hydraulic jack (1) via an upper permanent magnet ring (231), and remains relatively static with the hydraulic jack (1); The lower permanent magnet ring (213) and the upper permanent magnet ring (231) are designed to have a finely adjustable angle or curvature.

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