A stress monitoring and early warning device for steel trestle and Bailey frame structure

Abstract

The present invention discloses a force monitoring and early warning device for a steel trestle and Bailey frame structure, relating to the field of monitoring and early warning technology, comprising a main frame and a mounting mechanism, wherein the mounting mechanism is arranged on the outside of the main frame, the mounting mechanism comprising a bevel gear disc, a bevel gear, a propulsion rod and a support leg, the bevel gear disc is used to drive the bevel gear to rotate, and the propulsion rod is used to transmit the force of the rotation of the bevel gear to the support leg, so that the support leg moves outward until it is connected with the Bailey frame, so that the support leg moves outward in a sliding groove and is fixed with a limit position inside the Bailey frame, completing the preliminary installation, then unscrewing the bolt, so that the first spring loses its limit and bounces up the rotating frame, driving the spring telescopic rod to make the first sensor group fit the bottom of the steel trestle bridge plate, and the scale warning rod drives the second sensor group to be limited inside the Bailey frame, and the installation is completed, thereby solving the problem that the temporary steel trestle has many steps during installation and disassembly, the efficiency is slow, and the overall construction time is extended.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring and early warning, and in particular to a stress monitoring and early warning device for a steel trestle and Bailey frame structure. Background Art

[0002] A steel trestle is a temporary or semi-permanent bridge structure built with steel as the main material. It is usually assembled with Bailey frames, steel sections and other components. It has the characteristics of high strength, easy construction and reusability. It is widely used in temporary passages for bridge construction, water conservancy projects, municipal engineering and other scenarios. It can quickly cross obstacles such as rivers and valleys, providing transportation and access guarantees for engineering construction.

[0003] In order to ensure that the steel trestle and the internal Bailey frame structure can work safely and stably, it is necessary to monitor the working status of the steel trestle and the internal Bailey frame structure in real time. When a fault occurs, it can be known in time so that it can be stopped and repaired to reduce the occurrence of dangerous accidents. Therefore, a force monitoring and early warning device for the steel trestle and the Bailey frame structure is needed.

[0004] However, the existing stress monitoring and early warning device for a steel trestle and Bailey frame structure has the following shortcomings:

[0005] Currently, the stress monitoring and early warning devices for steel trestles and Bailey frames on the market all use a systematic method to connect multiple sensors. The stress conditions of the steel trestles and Bailey frames are detected through the numerical values ​​fed back by each sensor. However, there is no specific device structure to load the multiple sensors, which causes delays in signal transmission and coordination between the multiple sensors, and cannot promptly reflect real-time problems of the steel trestles and Bailey frames.

[0006] Therefore, we propose a stress monitoring and early warning device for steel trestle and Bailey frame structure in order to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a force monitoring and early warning device for a steel trestle and Bailey frame structure. When the device is installed, it is placed between the support rods in the middle of the Bailey frame, and the support legs on both sides of the bottom of the device are placed on the inner sides of the Bailey frame support rods. The rotating shaft is turned to drive the bevel gear disk to rotate, and the bevel gear meshing with it rotates accordingly. The large spur gear is rotated by the rotating rod, and then the small spur gear on the propulsion rod is driven to rotate, and the propulsion rod is rotated because the bevel gear disk is larger than the bevel gear. One rotation of the bevel gear disk can make the bevel gear rotate several times, and the large spur gear also rotates multiple times synchronously. Finally, the rotation of the bevel gear disk can quickly drive the propulsion rod to rotate, and the propulsion rod rotates in the limit bolt, and the support legs connected to it with the thread move in the sliding groove. When the support leg moves outward and contacts the inner side of the Bailey frame to be fixed in a limited position, the preliminary installation is completed. After the bolts are unscrewed, the first spring loses its limit and the rotating frame pops up. Since the limit frame and the connecting shaft can rotate, the rotating frame rotates with the connecting shaft as the fulcrum, driving the spring telescopic rod on the rotating frame to rotate synchronously until the first sensor group on the spring telescopic rod contacts and limits the bottom of the steel trestle bridge deck. At the same time, the scale warning stick drives the warning sign to the outside of the steel trestle, limiting the second sensor group to the inside of the Bailey frame. The installation is now complete. The compression pounds of the first spring, the second spring and the spring telescopic rod of the device can be adjusted according to the overall value of the steel trestle to be tested and the Bailey frame load-bearing value information.

[0008] When traffic passes over the steel trestle, the number and weight of vehicles cause the bridge deck to deform under pressure, pressing down on the first sensor group. The base of the bridge moves the warning sign on the scale warning rod downward to warn the road surface. The first sensor group reports the bridge deck deformation. If the bridge deck cannot recover from its deformation due to its own rigidity and internal structural damage, the ultrasonic waves in the first sensor group transmit a flaw detection report. If the Bailey frame deforms due to excessive weight, the distance sensor in the second sensor group issues an alarm, enabling multiple detection capabilities.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: a stress monitoring and early warning device for a steel trestle and Bailey frame structure, comprising a main frame and a mounting mechanism, wherein the mounting mechanism is arranged on the outside of the main frame;

[0010] The mounting mechanism includes a rotating shaft, a bevel gear plate, a bevel gear, a propulsion rod and a support leg. The bevel gear plate is used to drive the bevel gear to rotate, and the propulsion rod is used to transmit the force of the bevel gear rotation to the support leg, so that the support leg moves outward until it is connected with the Bailey frame. One end of the rotating shaft is rotatably connected to the outside of the connecting shaft, and a fixing block is installed at the other end of the connecting shaft. A spring seat is installed above the fixing block, and a first spring is installed on the inner side of the spring seat. A bolt is provided at the other end of the fixing block, and the bolt is threadedly connected to the fixing block. The outer side of the connecting shaft is rotatably connected to the rotating frame, and a spring telescopic rod is installed on the top of the rotating frame. The bottom of the rotating frame is connected to the first The top of the spring is fixedly connected, a slide groove is installed on the outside of the outer tube of the spring telescopic rod, a base is installed on the top of the spring telescopic rod, a plurality of second springs are installed on the top of the base, a first sensor group is installed on the top of each second spring, a switch is installed on the top of the rotating frame, the button position of the switch is located at the bottom of the base, a sliding rod is installed at the bottom of each first sensor group, the other ends of the plurality of sliding rods pass through the base, a scale warning rod is installed on the outside of the base, the scale warning rod is slidably connected to the inner side of the slide groove, a warning sign is installed on the top of the scale warning rod, and a second sensor group is installed on the top of the scale warning rod.

[0011] Preferably, the rotating shaft is rotatably connected to the main frame, the bevel gear disk is fixedly connected to the outside of the rotating shaft, multiple frames are installed on the outside of the main frame, multiple limit bolts are installed between the multiple frames, the inner side of one end of the limit bolt is rotatably connected to a large spur gear through a rotating rod, the other end of the rotating rod is provided with a bevel gear, and the inner side of the other end of the limit bolt is rotatably connected to a push rod.

[0012] Preferably, a small spur gear is installed on the outer side of the propulsion rod, and the other end of the propulsion rod is a threaded rod, and the small spur gear is meshed with the large spur gear.

[0013] Preferably, a sliding cylinder is installed on the outer side of the limiting bolt, and a supporting leg is slidably connected to the inner side of the sliding cylinder, and the supporting leg is threadedly connected to the propulsion rod.

[0014] Preferably, the outer side of the slide bar slides on the second spring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The compression poundage of the spring and telescopic rod in the equipment of the present invention can be adjusted as needed. The compression poundage of the spring is assembled according to the standard load, material and material of the Bailey frame and the overall load of each component of the steel trestle, so that when the steel trestle is open to traffic, the normal rigid deformation of the bridge plate will not cause misjudgment of the sensors. When the bridge plate is open to traffic, the bridge plate is pressed down by the weight of the vehicle, and the downward moving first sensor group drives the warning sign to move for real-time early warning. When the deformation range of the bridge plate reaches a certain standard, the downward pressure distance of the first sensor increases and the touch switch turns on the first sensor group and the second sensor group. At this time, the first sensor group operates to collect and feedback the deformation value and the real-time status of the bridge plate. When the bridge plate structure is damaged, the ultrasonic wave in the first sensor group transmits the flaw detection report. At the same time, when the Bailey frame is overweight and deformed, the distance sensor in the second sensor group alarms to achieve multiple detection. Therefore, multiple sensors are loaded through a specific device structure, so that the structure between the multiple sensors is stable, the signal transmission and coordination are timely, and the problems of the steel trestle and Bailey frame structure can be reflected in real time.

[0017] 2. The present invention places the device on the middle support rod of the Bailey frame, places the bottom support leg on the inner side of the support rod, twists the rotating shaft, and transmits through the bevel gear, bevel gear, large and small spur gears to quickly drive the propulsion rod to rotate, so that the support leg moves outward in the sliding groove and is fixed with the inner limit of the Bailey frame to complete the initial installation. Then the bolt is unscrewed, so that the first spring loses its limit and bounces up the rotating frame, driving the spring telescopic rod to make the first sensor group fit the bottom of the steel trestle bridge deck, and the scale warning rod drives the second sensor group to be limited on the inner side of the Bailey frame, and the installation is completed. This solves the problem that the temporary steel trestle has many steps during installation and disassembly, is slow in efficiency, and extends the overall construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a main structural stereogram of a force monitoring and early warning device for a steel trestle and Bailey frame structure according to the present invention;

[0019] Figure 2 This is a structural exploded perspective view of a force monitoring and early warning device for a steel trestle and Bailey frame structure according to the present invention;

[0020] Figure 3 This is an exploded perspective view of the installation mechanism in a force monitoring and early warning device for a steel trestle and Bailey frame structure of the present invention;

[0021] Figure 4 for Figure 3 A magnified view of point A in the figure;

[0022] Figure 5 for Figure 3 Enlarged view of point B in FIG.

[0023] Figure 6This is a partially exploded perspective view of the mounting mechanism in a stress monitoring and early warning device for a steel trestle and Bailey frame structure according to the present invention;

[0024] Figure 7 The present invention is a schematic diagram of the working status of a stress monitoring and early warning device for a steel trestle and Bailey frame structure.

[0025] In the figure: 1. main frame; 2. mounting mechanism; 201. rotating shaft; 202. bevel gear; 203. frame; 204. limiting bolt; 205. sliding cylinder; 206. large spur gear; 207. bevel gear; 208. propulsion rod; 209. supporting leg; 210. connecting shaft; 211. fixing block; 212. spring seat; 213. bolt; 214. first spring; 215. rotating frame; 216. spring telescopic rod; 217. slide; 218. base; 219. second spring; 220. first sensor group; 221. scale warning stick; 222. second sensor group; 223. warning sign; 224. switch. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] Example 1, according to Figure 1-Figure 5As shown, a force monitoring and early warning device for a steel trestle and Bailey frame structure includes a main frame 1 and a mounting mechanism 2. The mounting mechanism 2 is arranged on the outside of the main frame 1. The mounting mechanism 2 includes a rotating shaft 201, a bevel gear 202, a bevel gear 207, a propulsion rod 208 and a support leg 209. The bevel gear 202 is used to drive the bevel gear 207 to rotate, and the propulsion rod 208 is used to transmit the force of the rotation of the bevel gear 207 to the support leg 209, so that the support leg 209 moves outward until it is connected to the Bailey frame. The rotating shaft 201 is rotatably connected to the main frame 1, and the bevel gear 202 is fixedly connected to the outside of the rotating shaft 201. A plurality of frames 203 are installed on the outside of the main frame 1, and a plurality of A plurality of limit bolts 204 are installed between the frames 203. The inner side of one end of the limit bolt 204 is rotatably connected to a large spur gear 206 through a rotating rod, and a bevel gear 207 is installed at the other end of the rotating rod. The inner side of the other end of the limit bolt 204 is rotatably connected to a push rod 208, and a small spur gear is installed at the outer side of the push rod 208. The other end of the push rod 208 is a threaded rod, and the small spur gear is engaged with the large spur gear 206. A sliding cylinder 205 is installed at the outer side of the limit bolt 204, and the inner side of the sliding cylinder 205 is slidably connected to a support leg 209. The inner side of the support leg 209 is threadedly connected to the push rod 208, and the outer side of one end of the rotating shaft 201 is rotatably connected to a connecting shaft 210.

[0028] The effect achieved by the entire embodiment 1 is as follows: when the installation work starts, the device is placed in the middle support rods of the Bailey frame, and the supporting legs 209 on both sides of the bottom of the device are placed on the inner sides of the Bailey frame support rods, and the rotating shaft 201 is screwed. The rotating shaft 201 drives the bevel gear plate 202 to rotate, and then the bevel gear 207 engaged therewith rotates. The bevel gear 207 drives the large spur gear 206 connected by the rotating rod to rotate, and the large spur gear 206 then drives the small spur gear on the propulsion rod 208 to rotate the propulsion rod 208. Because the bevel gear plate 202 is larger than the bevel gear 207, the bevel gear plate 202 rotates one circle to drive the bevel gear 207 to rotate several circles, and the large spur gear 206 rotates synchronously with the bevel gear 207, so that the large spur gear 206 rotates one circle to drive the small spur gear to rotate several circles. Rotating the bevel gear plate 202 can quickly drive the propulsion rod 208 to rotate, and the propulsion rod 208 rotates in the limit bolt 204, and the support legs 209 threadedly connected thereto move in the sliding groove. The first spring 214 is released and the rotating frame 215 is lifted up, and the limiting frame and the connecting shaft 210 rotate. The rotating frame 215 rotates with the connecting shaft 210 as the fulcrum, and the spring telescopic rod 216 on the rotating frame 215 rotates synchronously until the first sensor group 220 on the spring telescopic rod 216 contacts and fits with the bottom of the steel trestle bridge deck. The scale warning rod 221 drives the warning sign 223 to extend to the outside of the steel trestle, and at the same time drives the second sensor group 222 to be limited inside the Bailey frame, thereby realizing the speed increase characteristic of the gear transmission. The bevel gear 202 is larger than the bevel gear 207. One rotation can drive the bevel gear 207 to rotate several times. Only by turning the rotating shaft 201 can the supporting leg 209 be quickly driven outward to achieve close fit and limited fixation between the device and the Bailey frame, greatly shortening the installation time and improving the construction efficiency.

[0029] Example 2, according to Figure 5-Figure 7 As shown, the outer side of the connecting shaft 210 is rotatably connected to a rotating frame 215, and a spring telescopic rod 216 is installed on the top of the rotating frame 215. The bottom of the rotating frame 215 is fixedly connected to the top of the first spring 214, and a slide groove 217 is installed on the outer side of the outer tube of the spring telescopic rod 216. A base 218 is installed on the top of the spring telescopic rod 216, and a plurality of second springs 219 are installed on the top of the base 218. A first sensor group 220 is installed on the top of each second spring 219. A switch 224 is installed on the top of the rotating frame 215, and the button position of the switch 224 is located at the bottom of the base 218. A sliding rod is installed at the bottom of each first sensor group 220, and the other end of the plurality of sliding rods passes through the base 218. A scale warning rod 221 is installed on the outer side of the base 218, and the scale warning rod 221 is slidably connected to the inner side of the slide groove 217. A warning sign 223 is installed on the top of the scale warning rod 221, and a second sensor group 222 is installed on the top of the scale warning rod 221.

[0030] The effect achieved by the entire embodiment 2 is as follows: the compression pounds of the first spring 214, the second spring 219 and the spring telescopic rod 216 on the device can be adjusted according to the overall value of the steel trestle and the load-bearing value information of the Bailey frame. When the steel trestle is open to traffic, the number and weight of vehicles cause the bridge deck to be crushed and deformed. The deformed bridge deck presses down the first sensor group 220, and the base 218 drives the warning sign 223 on the scale warning stick 221 to move downward to warn the road surface. The bridge deck deformation value is fed back by the first sensor group 220. If the bridge deck deformation cannot be restored or the internal structure is damaged, the ultrasonic wave in the first sensor group 220 transmits the flaw detection report. When the Bailey frame is overloaded and deformed, the distance sensor in the second sensor group 222 issues an alarm to achieve multiple detections. Among them, the first sensor group 220 is also provided with a temperature and humidity sensor, which combines strain data to correct the influence of temperature on structural stress. The vibration sensor is used to monitor the resonance frequency of the bridge and warn of fatigue damage. The AI ​​algorithm is integrated between the sensors to analyze historical data, predict the structural life and failure probability, and support 5G transmission to achieve remote real-time monitoring and multi-device linkage warning. The first sensor group 220 and the second sensor group 222 are modular sensor groups, which are suitable for different types of bridges. The first spring 214 bounces up the rotating frame 215 after the bolt 213 is unscrewed, so that the sensor group on the spring telescopic rod 216 automatically fits the bottom of the steel trestle bridge deck. This can adapt to the unevenness of the bridge deck surface, ensure close contact between the sensor and the bridge deck, and avoid monitoring errors caused by installation gaps. The compression pounds of the spring telescopic rod 216, the first spring 214, and the second spring 219 can be flexibly adjusted according to the bridge load value, adapting to steel trestles and Bailey frames of different specifications, enhancing the versatility of the device. The temperature and humidity sensor corrects the influence of temperature on the stress of the bridge structure and the strain error caused by thermal expansion and contraction in real time, improving the accuracy of monitoring data. The vibration sensor monitors the resonant frequency of the bridge, and identifies the risk of structural fatigue damage and crack propagation, as well as material aging through abnormal frequencies, to achieve early warning of diseases. Combined with the ultrasonic flaw detection function, it can detect internal structural damage, steel corrosion, and concrete cracking when the bridge deck deformation cannot be restored, realizing surface monitoring and internal flaw detection, and improving the comprehensiveness of detection. 5G The application of AI technology is in line with the development trend of intelligent transportation and the Internet of Things, laying a technical foundation for the intelligent and networked upgrade of future bridge health monitoring systems. Each sensor group is turned on by switch 224. When the steel trestle is working lightly, the sensor detection can be started remotely at regular intervals to save energy.

[0031] The working principle of the whole equipment is as follows: when the installation work starts, the device is placed in each supporting rod in the middle of the Bailey frame. At this time, the supporting legs 209 on both sides of the bottom of the device are placed on the inner side of the supporting rod of the Bailey frame. At this time, the rotating shaft 201 is screwed, and the rotating shaft 201 drives the bevel gear 202 to rotate synchronously, and drives the bevel gear 207 meshing with the bevel gear 202 to rotate. The bevel gear 207 rotates through the large spur gear 206 connected to the rotating rod, and drives the propulsion rod 208 to rotate through the small spur gear on the propulsion rod 208. Because the size of the bevel gear 202 is larger than the hammer gear, at this time, the bevel gear 207 can be driven to rotate several circles by one rotation of the bevel gear 202, and the large spur gear 206 fixed on the bevel gear 207 is synchronized with the bevel gear 207. At this time, the bevel gear 202 rotates The large spur gear 206 can be driven to rotate several times with one circle. When the large spur gear 206 continues to drive the small spur gear on the small propulsion rod 208 to rotate, the large spur gear 206 rotates one circle to drive the small spur gear to rotate several circles. Finally, the propulsion rod 208 can be directly driven to rotate rapidly by rotating the bevel gear plate 202. Since the propulsion rod 208 rotates in the limit bolt 204, the various support legs 209 threadedly connected to the propulsion rod 208 move in the sliding groove. When the various support legs 209 move outward at the same time and each contacts the inner side of the Bailey frame and is fixed in a limited position, the preliminary installation is completed. After that, the bolt 213 is unscrewed. At this time, the first spring 214 loses its limit and bounces the rotating frame 215. The limit frame rotates with the connecting shaft 210, and the rotating frame 215 is moved by the first spring 2 When the vehicle 14 bounces up, it rotates with the connecting shaft 210 as the fulcrum. At this time, the spring telescopic rod 216 on the rotating frame 215 rotates synchronously until the first sensor group 220 on the spring telescopic rod 216 contacts the bottom of the steel trestle bridge plate and limits it to the bottom of the steel trestle bridge plate. At this time, the scale warning rod 221 drives the warning sign 223 to extend to the outside of the steel trestle, and the scale warning rod 221 drives the second sensor group 222 to limit it to the inside of the Bailey frame. At this time, the installation work is completed. The compression pounds of the first spring 214, the second spring 219 and the spring telescopic rod 216 on this device can be adjusted according to the overall value of the steel trestle to be detected and the Bailey frame load value information. When the steel trestle is open to traffic, the number of vehicles within the specified distance and the total weight , by feeding back the degree of deformation of the bridge deck on the steel trestle, the deformed bridge deck presses the first sensor group 220 to move downward, and then the base 218 drives the warning sign 223 on the scale warning stick 221 to move downward, thereby giving an early warning to the road surface, and the specific value of the bridge deck deformation is fed back through the first sensor group 220 that is close to the bridge deck. If the deformation degree of the bridge deck cannot be restored by its own rigidity, the downward bending range of the bridge deck reaches the preset standard, and the base 218 is driven downward to touch the switch 224. The switch 224 turns on the first sensor group 220 and the second sensor group 222. At this time, the first sensor group 220 operates to collect and feed back the deformation value and the real-time status of the bridge deck. When the internal structure of the steel trestle is damaged,The ultrasonic waves in the first sensor group 220 transmit the inspection report information. When the Bailey frame is overloaded and deformed, the distance sensor in the second sensor group 222 issues an alarm, thereby realizing multiple detections. The first sensor group 220 and the second sensor group 222 adopt a modular design, which can be quickly adapted to different types of bridges such as steel trestles and Bailey frames. Among them, the first sensor group 220 has built-in temperature and humidity sensors, vibration sensors and other components. The temperature and humidity sensors can collect environmental temperature and humidity data in real time, and combine the strain data to correct the impact of temperature on structural stress. The vibration sensor is responsible for monitoring the resonant frequency of the bridge. Once an anomaly is detected, it can warn of the risk of fatigue damage. In addition, both sensor groups are integrated with AI algorithms to predict the structural life and failure probability by analyzing historical data. The device supports 5G transmission, which can realize remote real-time monitoring. When the monitoring data triggers the threshold, it can link multiple devices to issue warnings to ensure the safety of the bridge structure.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stress monitoring and early warning device for a steel trestle and Bailey frame structure, comprising a main frame (1) and a mounting mechanism (2), characterized in that: The mounting mechanism (2) is arranged on the outside of the main frame (1); The mounting mechanism (2) comprises a rotating shaft (201), a bevel gear (202), a bevel gear (207), a propulsion rod (208) and a support leg (209), wherein the bevel gear (202) is used to drive the bevel gear (207) to rotate, and the propulsion rod (208) is used to transmit the rotation force of the bevel gear (207) to the support leg (209), so that the support leg (209) moves outward until it is connected to the Bailey frame, and one end of the rotating shaft (201) is rotatably connected to the outside of the connecting shaft (210), and the other end of the connecting shaft (210) is connected to the outside of the connecting shaft (210). A fixing block (211) is installed at one end, a spring seat (212) is installed above the fixing block (211), a first spring (214) is installed inside the spring seat (212), a bolt (213) is provided at the other end of the fixing block (211), the bolt (213) is threadedly connected to the fixing block (211), the outer side of the connecting shaft (210) is rotatably connected to a rotating frame (215), a spring telescopic rod (216) is installed on the top of the rotating frame (215), and the rotating frame (21 5) is fixedly connected to the top of the first spring (214), a slide groove (217) is installed on the outer side of the outer tube of the spring telescopic rod (216), a base (218) is installed on the top of the spring telescopic rod (216), a plurality of second springs (219) are installed on the top of the base (218), and a first sensor group (220) is installed on the top of each second spring (219), a switch (224) is installed on the top of the rotating frame (215), and the button position of the switch (224) is Located at the bottom of the base (218), a slide bar is installed at the bottom of each of the first sensor groups (220), and the other ends of the plurality of slide bars pass through the base (218). A scale warning bar (221) is installed on the outside of the base (218), and the scale warning bar (221) is slidably connected to the inside of the slide groove (217). A warning sign (223) is installed on the top of the scale warning bar (221), and a second sensor group (222) is installed on the top of the scale warning bar (221).

2. The stress monitoring and early warning device for a steel trestle and Bailey frame structure according to claim 1 is characterized in that: The rotating shaft (201) is rotatably connected to the main frame (1), the bevel gear disc (202) is fixedly connected to the outside of the rotating shaft (201), a plurality of frames (203) are installed on the outside of the main frame (1), a plurality of limit bolts (204) are installed between the plurality of frames (203), the inner side of one end of the limit bolt (204) is rotatably connected to a large spur gear (206) via a rotating rod, the other end of the rotating rod is installed with a bevel gear (207), and the inner side of the other end of the limit bolt (204) is rotatably connected to a propulsion rod (208).

3. The stress monitoring and early warning device for a steel trestle and Bailey frame structure according to claim 2 is characterized in that: A small spur gear is installed on the outer side of the propulsion rod (208), and the other end of the propulsion rod (208) is a threaded rod. The small spur gear is meshed with the large spur gear (206).

4. The stress monitoring and early warning device for a steel trestle and Bailey frame structure according to claim 2 is characterized in that: A sliding cylinder (205) is installed on the outer side of the limiting bolt (204), and a supporting leg (209) is slidably connected to the inner side of the sliding cylinder (205), and the supporting leg (209) is threadedly connected to the propulsion rod (208).

5. The stress monitoring and early warning device for a steel trestle and Bailey frame structure according to claim 1 is characterized in that: The outer side of the slide bar slides on the second spring (219).

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