Screw rod and cable clamp assembly for suspension bridge

Abstract

The utility model discloses a screw rod and cable clamp assembly for a suspension bridge, which ensures that clutter interference can be effectively avoided when an ultrasonic detector measures the length change of the screw rod by designing the upper end face and the lower end face of a screw rod body into flat planes and limiting the plane roughness and the surface flatness of the two end faces. Higher detection precision is achieved; the detection areas are set on the two end faces of the screw body, and ultrasonic probes are placed in the detection areas every time detection is carried out, so that measurement errors caused by inconsistent placement positions of the probes are avoided, and a more accurate detection result is obtained; the penetrating hole is formed in the cable clamp structure, the screw rod is arranged in the penetrating hole, it is guaranteed that the exposed lengths of the upper end and the lower end of the screw rod are equal, it can be guaranteed that detection operation is more convenient, and meanwhile the situation that due to the fact that the length of the screw rod at one end is too short, threads on the screw rod at the short end are pulled to be damaged when a jack exerts pulling force on the screw rod is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge engineering construction technical field, concretely relates to a screw rod and cable clamp subassembly for suspension bridge. BACKGROUND

[0002] Suspension bridge cable clamp is the connecting component between the sling and the main cable, and the clamping force is provided by the screw rod. The insufficient screw rod force will cause the cable clamp to slip, which will lead to a series of consequences such as the internal force redistribution of the sling, the main cable shape change and the like, and seriously affect the bridge structure safety.

[0003] During the operation period of the suspension bridge, the screw rod force needs to be detected and fastened regularly to ensure the cable clamp anti-slipping safety factor. The usual detection method of the screw rod force needs to use the jack, oil pump and the like equipment to calculate the axial fastening force value by collecting the length data of the screw rod under different stress states. The detection of the screw rod length value mainly relies on the ultrasonic detection equipment. The coupling agent is brushed on the end of the screw rod, and the ultrasonic probe is tightly attached to the end face to collect the sound time value data. During the production and manufacturing process of the screw rod, a counterbore is usually left at the center position of the end face, which causes the probe of the ultrasonic detection equipment to be unable to be placed in the center, and affects the data collection efficiency and accuracy. At the same time, during the detection or supplement of the axial fastening force of the screw rod by using the jack in the prior art, the screw rod is easily damaged. SUMMARY

[0004] Based on the above analysis, the purpose of the utility model is to provide a screw rod and cable clamp subassembly for suspension bridge to solve the problems raised in the background art.

[0005] A screw rod for suspension bridge, comprising a screw rod body, the two ends of the screw rod body are provided with threads, the two ends of the screw rod body are also provided with end faces, the end faces are flat planes, the flatness of the end faces is ≤0.1mm, and the surface roughness of the end faces is ≤3.2μm.

[0006] Further, the center of the end face of the screw rod body has a detection area, and the detection area can define the placement position of the probe of the ultrasonic detector.

[0007] Further, the thread length of the two ends of the screw rod body is L1 and L1 respectively, and the L1 and the L1 satisfy the following relationship: L1=L2.

[0008] A cable clamp subassembly for suspension bridge, comprising the above screw rod for suspension bridge, a cable clamp body, a nut, and a gasket, the inside of the cable clamp body is a hollow structure, the hollow structure is used for threading the cable, the two sides of the cable clamp body are provided with connecting structures, the connecting structures are provided with threading holes, the screw rod body is arranged in the threading holes, the upper and lower ends of the screw rod are both provided with gaskets, the outer sides of the gaskets are both provided with nuts, and the nuts are in threaded connection with the screw rod body.

[0009] Further, a platform structure is arranged on the connecting structure, and the gasket abuts against the platform structure.

[0010] Further, the cable clamp body is composed of a first half cable clamp and a second half cable clamp, and the first half cable clamp and the second half cable clamp have a gap therebetween.

[0011] Compared with the prior art, the screw rod and the cable clamp assembly for the suspension bridge have the following beneficial effects: by designing the upper and lower two end faces of the screw rod body as flat planes, and limiting the plane roughness and the surface flatness of the two end faces, it is ensured that the ultrasonic detector can effectively avoid interference of clutter when measuring the length change of the screw rod, and higher detection precision is achieved.

[0012] By setting the detection area on the two end faces of the screw rod body, the ultrasonic probe is placed in the detection area each time detection is performed, measurement errors caused by inconsistent placement positions of the probe are avoided, and more accurate detection results are obtained.

[0013] By setting the through hole in the cable clamp structure and arranging the screw rod in the through hole, it is ensured that the threads on the upper and lower ends of the screw rod have a certain exposed length, detection operation is more convenient, and the situation that the threads on the short end of the screw rod are pulled off when the jack exerts pulling force on the screw rod is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained from these drawings.

[0015] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, to enable those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that the present application can produce, should still fall within the scope of the technical content disclosed by the present application.

[0016] Figure 1 is a cross-sectional view of the cable clamp assembly for the suspension bridge of the present application;

[0017] Figure 2 is Figure 1 is a local enlarged view of the cable clamp assembly at a position a.

[0018] Figure 3 It is the screw structure schematic diagram for suspension bridge of the utility model;

[0019] Figure 4 It is the screw end surface schematic diagram for suspension bridge of the utility model;

[0020] In the figure: 1 screw body, 11 upper end face, 12 lower end face, 21 first half cable clamp, 22 second half cable clamp, 23 connecting structure, 231 platform structure, 232 through hole, 24 gap, 3 nut, 4 washer, 5 probe. DETAILED DESCRIPTION

[0021] In order to make the purpose, features, advantages of the utility model more obvious and easy to understand, the technical scheme in the utility model embodiment will be described clearly and completely in the following with the drawings in the utility model embodiment, obviously, the following described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor are within the scope of the utility model.

[0022] The technical scheme of the utility model will be further illustrated by specific embodiments in the following in combination with the drawings.

[0023] Please refer to Figures 1-2 The utility model provides a technical scheme:

[0024] Embodiment one

[0025] A screw for suspension bridge, including screw body 1, the both ends of screw body 1 are equipped with screw threads, the both ends of screw body 1 also have end face, the end face is flat plane, the flatness of end face is ≤0.1mm, the surface roughness of end face is ≤3.2 μm.

[0026] The detection of the axial fastening force of the screw rod is realized by an ultrasonic detector. The screw rod will be deformed under the stretching effect of the axial fastening force, that is, the screw rod will be elongated. The length change of the screw rod can be detected by the ultrasonic detector, and the axial fastening force of the screw rod can be calculated. The principle of ultrasonic distance detection is to obtain the sound time value data through the propagation and reflection of ultrasonic waves in the screw rod, so as to detect the length of the screw rod. Therefore, the surface of the tested component is required to be relatively high. If the flatness of the reflecting surface is not enough, the existence of clutter and noise will be caused, and the waveform of the ultrasonic wave will be disturbed. When the conventional technology processes the threads on the screw rod body 1, the two ends of the screw rod body 1 need to be clamped by a jig. The clamped end of the screw rod will produce a counterbore. Therefore, the testing surface with the counterbore is not flat enough, which is not conducive to the accurate detection of the axial fastening force. In the embodiment, a processing procedure is added to remove the counterbore in the middle of the screw rod, and the end face of the screw rod body 1 is processed into a flat surface. Engineering practice shows that the flatness of the end face of the screw rod is less than or equal to 0.1 mm, and the surface roughness is less than or equal to 3.2 μm, which can ensure the detection accuracy to a certain extent.

[0027] When detecting the axial fastening force of the screw rod, the probe 5 of the ultrasonic detector is placed on the end face of the screw rod body 1. If the placement position of the probe 5 of the ultrasonic detector is different each time, the accuracy of the detection result will be affected. In the embodiment, a detection area D1 is drawn in advance on the center position of the end face of the screw rod body 1 according to the size of the probe 5 of the ultrasonic device. The detection area D1 can limit the placement position of the probe 5 of the ultrasonic detector. Referring to Figure 4 , D is the diameter of the end face of the screw rod. The measurement error caused by the inconsistent placement position of the probe 5 during each ultrasonic measurement process can be effectively avoided, and the accuracy of the axial fastening force of the screw rod can be effectively improved.

[0028] Embodiment two

[0029] A cable clamp assembly for a suspension bridge, referring to Figure 1 -2, comprising the screw rod for a suspension bridge, the cable clamp body, the nut 3, and the gasket 4. The cable clamp body is a hollow structure, the hollow structure is used for threading the cable, the cable clamp body is provided with a connecting structure 23 on both sides, the connecting structure is provided with a threading hole 232, the screw rod body 1 is arranged in the threading hole 232, the upper and lower ends of the screw rod are both provided with a gasket 4, the outer side of the gasket 4 is provided with a nut 3, and the nut 3 is in threaded connection with the screw rod body 1.

[0030] The measuring operation process of the screw axial fastening force is as follows: the jack is used to exert a pulling force on the screw, the exertion end of the jack is provided with a screw cap, the screw cap is fixedly connected with the external thread on the screw body 1, the screw is deformed under the action of the pulling force, the nut 3 on the screw body 1 is tightened, the fastening force of the screw is supplemented, and the ultrasonic detector is used to measure the deformation length of the screw, so that the size of the screw axial fastening force is detected.

[0031] The connecting structure 23 is provided with a platform structure 231, the gasket 4 abuts against the platform structure 231, and the platform structure 231 is arranged to facilitate the fastening of the cable clamp assembly by the screw and the nut 3.

[0032] The cable clamp body is composed of the first half cable clamp 21 and the second half cable clamp 22, and the first half cable clamp 21 and the second half cable clamp 22 have a gap 24 therebetween, in the process of tightening the nut 3, the gap 24 between the first half cable clamp 21 and the second half cable clamp 22 is reduced, the smaller the gap 24 is, the greater the fastening force is, and the cable clamp assembly is more firmly fastened.

[0033] The thread lengths of the screw body at two ends are L1 and L1 respectively, and L1 and L1 satisfy the following relationship: L1 = L2.

[0034] At present, the thread lengths of the screws used in the suspension bridge are mostly longer at one end and shorter at the other end, which often causes the thread of the screw at one end to be exposed and shorter after the suspension bridge is installed, and the side with the relatively shorter exposed thread length may be damaged when bearing the axial pulling force of the jack, for example, 10 turns of thread usually bear a pulling force of 6 tons, but if the exposed thread length is too short, 4 turns of thread may bear the same large pulling force, and the axial pulling force borne by a single turn of thread is too large, which may cause the thread to be damaged, so it is difficult to detect and supplement the fastening force of the cable clamp from the short end of the screw, and the corresponding detection and fastening work can only be completed with the help of the main cable maintenance vehicle in specific cases, and the work efficiency is very low; since the total length L of the screw is constant, if the exposed thread length at one end of the screw is too long, the exposed thread length of the screw at the other end will be relatively short, therefore, the screw structure of the embodiment requires that the thread lengths L1 and L2 at two ends of the screw are equal, as shown in Figure 3 , which can ensure that the thread lengths at two ends of the screw are exposed to a certain length after the suspension bridge is installed, and can meet the requirements of the detection and supplement of the screw fastening force of the cable clamp assembly during the operation period.

[0035] The above-described above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A stud for a suspension bridge, comprising a stud body, both ends of the stud body being provided with a thread, both ends of the stud body also having an end face, characterized in that, The end face is a flat plane, flatness of the end face is less than or equal to 0.1mm, and surface roughness of the end face is less than or equal to 3.2μm.

2. The hanger wire of a suspension bridge according to claim 1, characterized in that, The center of the end face of the screw body has a detection area, which can define a placement position of an ultrasonic detector probe.

3. The hanger wire of a suspension bridge according to claim 1, wherein The thread length of the screw body at two ends is L1 and L1 respectively, and the L1 and the L1 satisfy the following relationship: L1=L2.

4. A cable clamp assembly for a suspension bridge, characterized by, The utility model relates to a screw for suspension bridge, cable clamp body, nut, washer, the inside of the cable clamp body is hollow structure, the hollow structure is used for setting up cable, both sides of the cable clamp body are equipped with connecting structure, the connecting structure is equipped with the hole of setting up in, the screw body is equipped in the hole of setting up, the upper and lower ends of the screw are all equipped with washer, the outside of the washer is equipped with nut, and the nut is connected with the screw body threadedly.

5. The cable clamp assembly for a suspension bridge of claim 4, wherein, The connecting structure is provided with a platform structure, and the washer abuts against the platform structure.

6. The cable clamp assembly for a suspension bridge of claim 4, wherein, The cable clamp body is composed of a first half cable clamp and a second half cable clamp, and the first half cable clamp and the second half cable clamp have a gap therebetween.

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