Suspension bridge cable clamp screw stress monitoring device based on ultrasonic sensor

Abstract

The utility model discloses a suspension bridge cable clamp screw stress monitoring device based on an ultrasonic sensor, and relates to the technical field of bridge engineering detection. The utility model aims to solve the problem that a sensor is not easy to fix in an existing suspension bridge cable clamp screw stress nondestructive monitoring method. According to the suspension bridge cable clamp screw stress monitoring device based on the ultrasonic sensor, a nut cap is of a cylindrical cavity structure with an opening in the bottom, internal threads are arranged on the inner circumferential wall of the nut cap, and a pressing block is elastically connected with the inner top of the nut cap; threads are arranged on the inner circumference and the outer circumference of the nut, the inner threads of the nut are used for being in threaded connection with a connecting screw on the cable clamp, the outer threads of the nut are used for being in threaded connection with the inner threads of the nut cap, and the axial length of the nut is larger than the length, exceeding the gasket, of the end of the screw. When the nut cap is in threaded connection with the nut, the pressing block can tightly press the ultrasonic sensor on the end portion of the screw rod to be tested.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering detection. Background Art

[0002] A suspension bridge utilizes cables suspended from towers and anchored on both sides as the primary load-bearing superstructure. The cable geometry is determined by the equilibrium of forces and generally approximates a parabola. Numerous hangers are suspended from the cables, suspending the bridge deck. Stiffening beams are often installed between the deck and the hangers, forming a combined system with the cables to reduce deflection caused by loads. The external forces acting on a material are called external loads, while the reaction forces generated within the material are called stresses. When an object is pulled at both ends, the stress resisting the extension along its axis is called tensile stress. Tensile stress is the reaction of an object to an external force that causes it to stretch. Therefore, the stress state of the cable clamp screws in a suspension bridge plays a critical role in the safety and service life of the bridge.

[0003] Existing nondestructive monitoring methods for suspension bridges primarily include magnetic particle testing and ultrasonic testing. Magnetic particle testing, however, requires a strict testing environment and is unsuitable for testing cable clamp screws on suspension bridges. Ultrasonic testing typically requires an ultrasonic sensor to be fixed to the screw. Existing methods typically involve drilling holes in the screw to secure the ultrasonic sensor to the tested screw. However, this is not truly nondestructive testing, and the sensor installation process is cumbersome, time-consuming, and labor-intensive. Utility Model Content

[0004] The utility model aims to solve the problem that the sensor is difficult to fix in the existing non-destructive monitoring method for the stress of the cable clamp screw of a suspension bridge, and now provides a suspension bridge cable clamp screw stress monitoring device based on an ultrasonic sensor.

[0005] A suspension bridge cable clamp screw stress monitoring device based on an ultrasonic sensor includes: a nut, a nut cap, an ultrasonic sensor and a pressure block;

[0006] The nut cap is a cylindrical cavity structure with an open bottom, an inner circumferential wall of the nut cap is provided with an internal thread, and the pressing block is elastically connected to the inner top of the nut cap;

[0007] The inner and outer circumferences of the nut are both provided with threads, the inner threads of the nut are used to be threadedly connected to the connecting screw on the cable clamp, and the outer threads of the nut are used to be threadedly connected to the inner threads of the nut cap, and the axial length of the nut is greater than the length of the screw end extending beyond the gasket;

[0008] When the nut cap is threadedly connected to the nut, the pressing block can press the ultrasonic sensor onto the end of the screw being measured.

[0009] Furthermore, the pressing block is elastically connected to the inner top of the nut cap via a spring.

[0010] Furthermore, a turntable is provided on the top of the nut cap, and both ends of the spring are connected to the pressure block and the turntable respectively.

[0011] Furthermore, the number of the above-mentioned pressing blocks is at least one, and a plug-in block is provided on the top of the pressing block, and a plug-in slot is provided on the bottom, and two pressing blocks can be connected to each other through the plug-in block and the plug-in slot.

[0012] Furthermore, a through hole is formed on the nut cap, and the through hole serves as a lead-out hole for the connecting wire of the ultrasonic sensor.

[0013] Furthermore, the outer wall of the nut cap is provided with axial ridges.

[0014] Furthermore, the nut is divided into two sections along the axial direction, the outer surface of one section is provided with an external thread, and the outer surface of the other section is provided with axial ridges.

[0015] The beneficial effects of the suspension bridge cable clamp screw stress monitoring device based on ultrasonic sensors described in the utility model are as follows:

[0016] 1. This utility model uses a nut cap to connect the nut thread, and then uses a pressure block to squeeze the ultrasonic sensor to the end of the screw to achieve the fixation of the ultrasonic sensor. This utility model does not require drilling or other damage to the screw, truly achieving non-destructive monitoring.

[0017] 2. The utility model extends the axial length of the nut, which not only protects the screw, but also increases the length of the threaded connection with the screw, making the connection more stable.

[0018] 3. The utility model uses the nut cap and the nut to form an independent space for placing the ultrasonic sensor, which can reduce external interference and make the monitoring results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the cable clamp status when the ultrasonic sensor is not installed;

[0020] Figure 2 Schematic diagram of the screw end of a suspension bridge cable clamp screw stress monitoring device equipped with an ultrasonic sensor;

[0021] Figure 3 for Figure 2 sectional view of

[0022] Figure 4 Schematic diagram of the stress monitoring device for the cable clamp screw of a suspension bridge when the nut cap is not installed;

[0023] Screw 1, nut 2, washer 3, cable clamp 4, nut cap 5, ultrasonic sensor 6, pressure block 7, spring 8. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the embodiments in the present invention and the features in the embodiments can be combined with each other in the absence of conflict.

[0025] Reference Figures 1 to 4 Specifically describing this embodiment, the suspension bridge cable clamp screw stress monitoring device based on ultrasonic sensor described in this embodiment includes: a nut 2, a nut cap 5, an ultrasonic sensor 6 and a pressure block 7;

[0026] The nut cap 5 is a cylindrical cavity structure with an open bottom. An internal thread is provided on the inner circumferential wall of the nut cap 5. The pressing block 7 is elastically connected to the inner top of the nut cap 5.

[0027] The nut 2 is provided with threads on both the inner and outer circumferences. The internal threads of the nut 2 are used to be threadedly connected to the connecting screw on the cable clamp, and the external threads of the nut 2 are used to be threadedly connected to the internal threads of the nut cap 5. The axial length of the nut 2 is greater than the length of the screw end extending beyond the washer 3.

[0028] When the nut cap 5 is threadedly connected to the nut 2 , the pressing block 7 can press the ultrasonic sensor 6 onto the end of the screw rod 1 to be measured.

[0029] Preferably, the pressing block 7 is elastically connected to the inner top of the nut cap 5 via a spring 8 .

[0030] Preferably, a turntable is provided at the top of the nut cap 5 , and both ends of the spring 8 are connected to the pressing block 7 and the turntable respectively.

[0031] Preferably, the number of the above-mentioned pressing block 7 is at least one, and the top of the pressing block 7 is provided with a plug-in block, and the bottom is provided with a plug-in slot, and two pressing blocks 7 can be connected to each other through the plug-in block and the plug-in slot.

[0032] Preferably, a through hole is formed on the nut cap 5 , and the through hole serves as a lead-out hole for the connecting wire of the ultrasonic sensor 6 .

[0033] Preferably, the outer wall of the nut cap 5 is provided with axial ridges.

[0034] Preferably, the nut 2 is divided into two sections along the axial direction, the outer surface of one section is provided with an external thread, and the outer surface of the other section is provided with axial ridges.

[0035] The principles of this implementation are as follows:

[0036] The structure of the existing suspension bridge cable clamp screw is as follows Figure 1 As shown, the upper and lower cable clamps 4 are connected by a screw rod 1, and the two ends of the screw rod 1 are respectively threadedly connected by two nuts 2, clamping the two cable clamps 4 in the middle. A washer 3 is also provided between the nut 2 and the cable clamp 4.

[0037] The suspension bridge cable clamp screw stress monitoring device based on ultrasonic sensor described in this embodiment is as follows: Figure 2-4 As shown, based on the existing technology, the existing nut is modified into a structure with internal and external double threads and an increased axial length. The internal thread is still used to connect to the screw 1, performing its basic fixing function. While its increased axial length increases the length of the connection with the screw 1, the connection structure is more stable. In addition, the nut is allowed to protrude from the end of the screw 1, leaving space for the ultrasonic sensor 6 to be placed, thus protecting the ultrasonic sensor 6. Furthermore, the nut cap 5 is placed on the end of the nut 2 and the nut cap 5 is threadedly locked with the external thread of the nut 2. This protects the external portion of the ultrasonic sensor 6, reduces interference from the external environment, and makes the monitoring results more accurate.

[0038] The pressure block 7 in this embodiment can play the role of pressing the ultrasonic sensor 6 against the end of the screw. In its natural state, the spring 8 naturally stretches. As the nut cap 5 and the nut 2 are connected, the space between the nut cap 5 and the nut 2 is gradually compressed, and the spring 8 is compressed, thereby pressing the ultrasonic sensor 6 through the pressure block 7. If the nut cap 5 and the nut 2 have reached the deepest connection depth, and there is still distance between the end of the screw and the pressure block 7, the number of pressure blocks 7 can be increased, and multiple pressure blocks 7 can be connected through connectors and sockets until the ultrasonic sensor 6 can be pressed. In addition, the turntable set at the top of the nut cap 5 can prevent the spring 8 from being twisted and losing its elasticity when the nut cap is rotated.

[0039] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A suspension bridge cable clamp screw stress monitoring device based on an ultrasonic sensor, characterized in that: include: Nut (2), nut cap (5), ultrasonic sensor (6) and pressure block (7); The nut cap (5) is a cylindrical cavity structure with an opening at the bottom, an inner circumferential wall of the nut cap (5) is provided with an internal thread, and the pressing block (7) is elastically connected to the inner top of the nut cap (5); The nut (2) is provided with threads on both the inner and outer circumferences. The inner thread of the nut (2) is used for threaded connection with the connecting screw on the cable clamp. The outer thread of the nut (2) is used for threaded connection with the inner thread of the nut cap (5). The axial length of the nut (2) is greater than the length of the screw end extending beyond the gasket (3). When the nut cap (5) is threadedly connected to the nut (2), the pressing block (7) can press the ultrasonic sensor (6) against the end of the screw rod (1) to be measured.

2. The device for monitoring the stress of a suspension bridge cable clamp screw based on an ultrasonic sensor according to claim 1, characterized in that: The pressing block (7) is elastically connected to the inner top of the nut cap (5) via a spring (8).

3. The device for monitoring the stress of a suspension bridge cable clamp screw based on an ultrasonic sensor according to claim 2, characterized in that: A rotating disk is provided on the top of the nut cap (5), and two ends of the spring (8) are respectively connected to the pressing block (7) and the rotating disk.

4. The device for monitoring stress of a suspension bridge cable clamp screw rod based on an ultrasonic sensor according to claim 1, 2 or 3, characterized in that: The number of the pressing block (7) is at least one, The top of the pressing block (7) is provided with a plug-in block, and the bottom is provided with a plug-in slot, and two pressing blocks (7) can be connected to each other through the plug-in block and the plug-in slot.

5. The device for monitoring the stress of a suspension bridge cable clamp screw based on an ultrasonic sensor according to claim 1, characterized in that: A through hole is formed on the nut cap (5), and the through hole serves as a lead-out hole for the connecting wire of the ultrasonic sensor (6).

6. The device for monitoring the stress of a suspension bridge cable clamp screw based on an ultrasonic sensor according to claim 1, characterized in that: Axial ridges are provided on the outer wall of the nut cap (5).

7. The device for monitoring the stress of a suspension bridge cable clamp screw based on an ultrasonic sensor according to claim 1, characterized in that: The nut (2) is divided into two sections along the axial direction, the outer surface of one section is provided with an external thread, and the outer surface of the other section is provided with axial ridges.

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