Simple support box girder static test device and test method thereof

Abstract

The invention discloses a simply-supported box girder static test device and a test method thereof.The simply-supported box girder static test device comprises a gantry walking loading frame and a walking displacement crack monitoring device, walking wheels at the bottom of the gantry walking loading frame are placed between double vertical walking rails, walk in the length direction of simply-supported beams placed on supporting piers and cover the multiple simply-supported beams, and the walking displacement crack monitoring device is arranged on the walking wheels; the double vertical walking rails are fixedly connected to the ground, multiple sets of hydraulic cylinders are arranged at the bottom of the gantry walking loading frame, each set of hydraulic cylinders corresponds to one simply-supported beam, and the walking displacement crack monitoring device is installed at the bottom of the simply-supported box beam and walks in the length direction of the simply-supported box beam. A plurality of simply-supported box girders are loaded at one time for static load test, displacement deformation and crack conditions of the simply-supported box girders under single-point loading are detected at the same time, the test efficiency is greatly improved, automatic walking is achieved, the automation level is greatly improved, static load and crack condition detection under the single-point loading condition can be truly simulated, and the test efficiency is greatly improved. Crack and displacement integrated simultaneous detection is achieved, equipment is simplified, and cost is lower.

Description

Technical Field

[0001] The invention belongs to the technical field of simply supported box girder testing equipment, relates to a simply supported box girder static testing device, and also relates to a testing method for the simply supported box girder static testing device. Background Art

[0002] As the main structural type of China's high-speed rail, the simply supported box girder has initially achieved standardized construction, and information management and intelligent equipment have also been introduced in the construction process. However, the level of automation in the detection process is not high enough, and the detection can only be carried out on a single simply supported box girder. The test efficiency is low. Under static load, the top is loaded at the same time, which makes it difficult to achieve static load simulation of the actual single-point loading situation.

[0003] A Chinese patent application (application number 2006200115186) discloses a test device for a simply supported box girder. The patent adopts a static load test of a simply supported box girder under a uniform top load. It cannot realize the simultaneous detection of multiple simply supported box girders and requires manual displacement detection during the test, which is inefficient and cannot realize the test simulation of the actual single-point loading situation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a static test device for a simply supported box girder and a test method thereof, which can simultaneously realize the displacement deformation detection and crack condition detection of multiple simply supported box girders, greatly improve the efficiency, reduce the cost, and also facilitate the simulation of single-point force loading in actual conditions.

[0005] The technical solution adopted by the present invention is: a static test device for a simply supported box girder, including a gantry walking loading frame and a walking displacement crack monitoring device, wherein the walking wheels at the bottom of the gantry walking loading frame are placed between double vertical walking tracks, and the frame walks along the length direction of the simply supported beams placed on the supporting piers, covering multiple simply supported beams, and the double vertical walking tracks are fixedly connected to the ground, and multiple groups of hydraulic cylinders are arranged at the bottom of the gantry walking loading frame, and each group of hydraulic cylinders corresponds to a simply supported beam, and the walking displacement crack monitoring device includes a lower electric walking frame, multiple groups of lower displacement sensors and crack scanners, and the multiple groups of lower displacement sensors and crack scanners are installed on the lower electric walking frame, and the lower electric walking frame is placed under the multiple simply supported beams, and the frame walks along the length direction of the simply supported beams.

[0006] Furthermore, the above-mentioned double vertical walking track includes an upper I-rail and a lower I-rail, which are arranged vertically side by side at a set interval, and both ends are fixedly connected to a fixing seat, and the lower I-rail and the fixing seat are fixedly connected to the ground.

[0007] Furthermore, an elastic buffer limit mechanism is arranged on the top of the fixing seat, and a limit rod is arranged on the end of the gantry walking loading frame facing the same.

[0008] Furthermore, the bottom running wheel on one side adopts a plurality of running wheels to form a wheel set structure.

[0009] Furthermore, each group of hydraulic cylinders is connected to a hydraulic pump via a hydraulic synchronization valve.

[0010] Furthermore, the top of the gantry walking loading frame is configured as an arched frame structure.

[0011] Furthermore, the above-mentioned simply supported box girder static test device also includes two sinking monitoring displacement sensors arranged on two supporting piers of the simply supported beam, and the sinking monitoring displacement sensors are installed on two double vertical walking tracks through sensor brackets.

[0012] Furthermore, the electric walking frame comprises a lower gantry walking frame, inner walking rails and an electric driving mechanism. The lower gantry walking frame is placed on two inner walking rails and is equipped with an electric driving mechanism to drive it to walk.

[0013] A test method for a simply supported box girder static test device, the method comprising the following steps: Step 1: Install the simply supported box girder static test device, place the lower displacement sensor and crack scanner in the starting position, and the hydraulic cylinder in the starting position; Step 2: Control the gantry travel loading frame to move to the set position, and control the hydraulic cylinder to load the simply supported beam of the static test, and stop loading after reaching the set hydraulic pressure; Step 3: After the load is stable for a few minutes, the displacement sensor and crack scanner are controlled to move to the set position to perform displacement measurement and crack detection, and the sinking displacement of the supporting pier is obtained by using the sinking monitoring displacement sensor, and the displacement data of different positions and the crack detection of the entire bottom surface of the simply supported box girder are obtained, and then the next position is changed for detection until all positions are detected; Step 4: Based on the collected data from the displacement sensor and the sinking monitoring displacement sensor, displacement curves under different loading positions are formed, and crack detection conditions under different loading positions are obtained based on the crack scanner.

[0014] Furthermore, the above steps 1 to 4 are repeated using different static loads to obtain displacement curves and crack detection conditions under different static loads.

[0015] Beneficial effects of the present invention: Compared with the prior art, the effects of the present invention are as follows: (1) The present invention adopts a method of loading multiple simply supported box girders at one time to carry out static load test, and detects the displacement deformation and crack conditions of the simply supported box girders under single point loading. The test efficiency is greatly improved, and the automatic walking greatly improves the automation level. In addition, the static load and crack condition detection under single point loading can be truly simulated, and the crack and displacement are integrated and detected simultaneously, which further improves the test efficiency, simplifies the equipment, and reduces the cost. (2) The walking track is composed of an upper I-rail and a lower I-rail. The walking track serves as a dual function of a walking support and a loading support. It has good rigidity, high strength, and stable and reliable support. The upper I-rail meets the set conditions for minimum deformation under maximum loading. (3) An elastic buffer limit mechanism is set up to provide buffer protection for the walking mechanism moving to both sides, thus preventing damage to the equipment caused by excessive inertia due to collision during walking; (4) The machine uses a walking wheel set for walking and support, with a large bearing surface, and the walking and support are stable and reliable; (5) The synchronous valve control can realize the synchronous loading of the hydraulic cylinder group, and the loading is stable and reliable, and the force is balanced; (6) The arched frame structure has high rigidity and strength, which can meet the loading of multiple groups of hydraulic cylinders at the same time, improve the installation stability, and avoid the mutual influence of the loading of the two groups of simply supported beams due to excessive deformation; (7) Install a displacement sensor on the supporting pier to detect the deformation of the supporting pier, remove the deformation when calculating the specific deformation data, improve the accuracy of displacement detection, and be more conducive to obtaining the deformation curve accurately; (8) The electric travel door frame is used to facilitate the installation of displacement sensors and crack detectors, and the travel is stable and reliable; (9) By adopting single-point loading at different positions and monitoring displacement deformation and crack conditions, defects at different positions of the simply supported box girder can be discovered in advance, thereby improving the safety of the use of the simply supported box girder; the displacement deformation curve is obtained by combining the monitoring data of the sinking displacement sensor to improve the accuracy of the displacement deformation curve; (10) Conduct a maximum load-bearing test under different load conditions to determine the safety factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the simply supported beam static load test device; Figure 2 This is a schematic diagram of the gantry walking loading frame structure; Figure 3 Schematic diagram of the installation structure of the sinking monitoring displacement sensor. DETAILED DESCRIPTION

[0017] The invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Example 1: Reference Figure 1-3 The present invention shows a static testing device for a simply supported box girder, comprising a gantry walking loading frame 301 and a walking displacement crack monitoring device 302. The walking wheels at the bottom of the gantry walking loading frame 301 are placed between double vertical walking tracks 303, and the frame travels along the length direction of the simply supported beams 1 placed on the supporting piers, covering multiple simply supported beams 1. The double vertical walking tracks 303 are fixedly connected to the ground. A plurality of groups of hydraulic cylinders 304 are arranged at the bottom of the gantry walking loading frame 301, and each group of hydraulic cylinders 304 corresponds to a simply supported beam 1. The walking displacement crack monitoring device 302 comprises a lower electric walking frame 305, a plurality of groups of lower displacement sensors 306 and a crack scanner 307. The plurality of groups of lower displacement sensors 306 and the crack scanner 307 are installed on the lower electric walking frame 305. The lower electric walking frame 305 is placed below the multiple simply supported beams 1, and travels along the length direction of the simply supported beams 1.

[0019] In order to allow the walking track to serve the dual role of walking support and loading support, the double vertical walking track 303 includes an upper I-rail 308 and a lower I-rail 309. The upper I-rail 308 and the lower I-rail 309 are vertically arranged side by side at a set interval, and both ends are fixedly connected to the fixing seat 310. The lower I-rail 309 and the fixing seat 310 are fixedly connected to the ground. The walking track has good rigidity, high strength, stable and reliable support, and the upper I-rail meets the set conditions for minimum deformation under maximum loading.

[0020] In order to buffer and protect the gantry traveling loading frame, an elastic buffer limit mechanism 311 is arranged on the top of the fixed seat 310, and a limit rod 312 is arranged at the end of the gantry traveling loading frame. When the limit rod moves to the end, it will abut against the elastic buffer limit mechanism 311, thereby achieving a buffer protection effect.

[0021] In order to achieve stable walking and stable loading support of the walking mechanism, the bottom walking wheel on one side adopts multiple walking wheels to form a wheel group structure. The multiple walking wheels form a wheel group structure, the walking support and loading support area are large, the force surface is larger, and the support and loading stability are better.

[0022] In order to achieve synchronous loading, each group of hydraulic cylinders 304 is connected to the hydraulic pump via a hydraulic synchronization valve, and the hydraulic synchronization valve can ensure that the force of each group of hydraulic cylinders is balanced and loaded synchronously.

[0023] In order to improve the rigidity and stability of loading, the top of the gantry walking loading frame 301 is set as an arch frame structure. The arch frame structure is lighter and more convenient for installation while meeting the load-bearing requirements.

[0024] In order to achieve more accurate displacement monitoring, a simply supported box girder static test device also includes two sinking monitoring displacement sensors 313 arranged on the two supporting piers of the simply supported beam 1. The sinking monitoring displacement sensors 313 are installed on two double vertical walking tracks 303 through sensor brackets 314. The two sinking monitoring displacement sensors 313 are used to monitor the sinking amount of the supporting piers. The measurement data of the displacement sensors is combined and the average value of the two sinking monitoring displacement sensors is subtracted to make the monitoring more accurate.

[0025] In order to quickly install the displacement sensor and the crack detector, the electric walking frame 305 includes a lower gantry walking frame 315, an inner walking rail 316 and an electric driving mechanism 317. The lower gantry walking frame 315 is placed on two inner walking rails 316 and is equipped with an electric driving mechanism 317 to drive it to move. The electric walking gantry frame is used to facilitate the installation of the displacement sensor and the crack detector, and the movement is stable and reliable.

[0026] Embodiment 2: A test method for a simply supported box girder static test device, the method comprising the following steps: Step 1: Install the simply supported box girder static test device, place the lower displacement sensor 306 and the crack scanner 307 in the starting position, and the hydraulic cylinder 304 in the starting position; Step 2: Control the gantry travel loading frame to move to the set position, and control the hydraulic cylinder to load the simply supported beam of the static test, and stop loading after reaching the set hydraulic pressure; Step 3: After the loading is stable for a few minutes, the displacement sensor 306 and the crack scanner 307 are controlled to move to the set position to perform displacement measurement and crack detection, and the sinking displacement of the supporting pier is obtained by using the sinking monitoring displacement sensor, and the displacement data of different positions and the crack detection of the entire bottom surface of the simply supported box girder are obtained, and then the next position is changed for detection until all positions are detected; Step 4: Based on the collected data from the displacement sensor and the sinking monitoring displacement sensor, displacement curves under different loading positions are formed, and crack detection conditions under different loading positions are obtained based on the crack scanner.

[0027] Furthermore, the above steps 1 to 4 are repeated using different static loads to obtain displacement curves and crack detection conditions under different static loads.

[0028] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A static test device for a simply supported box girder, characterized in that: The invention comprises a gantry walking loading frame (301) and a walking displacement crack monitoring device (302). The walking wheels at the bottom of the gantry walking loading frame (301) are placed between two vertical walking tracks (303) and travel along the length direction of the simply supported beams (1) placed on the supporting piers, covering a plurality of simply supported beams (1). The two vertical walking tracks (303) are fixedly connected to the ground. A plurality of groups of hydraulic cylinders (304) are arranged at the bottom of the gantry walking loading frame (301). Each group of hydraulic cylinders (304) corresponds to a simply supported beam (1). The walking displacement crack monitoring device (302) comprises a lower electric walking frame (305), a plurality of groups of lower displacement sensors (306) and a crack scanner (307). The plurality of groups of lower displacement sensors (306) and the crack scanner (307) are installed on the lower electric walking frame (305). The lower electric walking frame (305) is placed below the plurality of simply supported beams (1) and travels along the length direction of the simply supported beams (1).

2. A static test device for a simply supported box beam according to claim 1, characterized in that: The double vertical walking track (303) comprises an upper I-shaped steel rail (308) and a lower I-shaped steel rail (309). The upper I-shaped steel rail (308) and the lower I-shaped steel rail (309) are arranged side by side vertically at a set interval, and both ends are fixedly connected to a fixing seat (310). The lower I-shaped steel rail (309) and the fixing seat (310) are fixedly connected to the ground.

3. A static test device for a simply supported box beam according to claim 2, characterized in that: An elastic buffer limit mechanism (311) is provided on the top of the fixed seat (310), and a limit rod (312) is provided on the opposite end of the gantry travel loading frame.

4. A static test device for a simply supported box beam according to claim 1, characterized in that: The bottom running wheel on one side adopts a plurality of running wheels to form a wheel set structure.

5. A static test device for a simply supported box girder according to claim 2, characterized in that: Each group of hydraulic cylinders (304) is connected to a hydraulic pump via a hydraulic synchronization valve.

6. A static test device for a simply supported box girder according to claim 3, characterized in that: The top of the gantry walking loading frame (301) is arranged as an arched frame structure.

7. A static test device for a simply supported box beam according to claim 4, characterized in that: It also includes two sinking monitoring displacement sensors (313) arranged on two supporting piers of the simply supported beam (1), and the sinking monitoring displacement sensors (313) are installed on two double vertical walking tracks (303) via sensor brackets (314).

8. The simply supported box girder static test device according to claim 1, characterized in that: The lower electric walking frame (305) comprises a lower gantry walking frame (315), inner walking rails (316) and an electric driving mechanism (317). The lower gantry walking frame (315) is placed on two inner walking rails (316) and is equipped with an electric driving mechanism (317) to drive the lower gantry walking frame (315) to travel.

9. The test method of a static test device for a simply supported box girder according to claim 1, characterized in that: The method comprises the following steps: Step 1: Install the simply supported box girder static test device, place the lower displacement sensor (306) and the crack scanner (307) at the starting position, and place the hydraulic cylinder (304) at the starting position; Step 2: Control the gantry travel loading frame to move to the set position, and control the hydraulic cylinder to load the simply supported beam of the static test, and stop loading after reaching the set hydraulic pressure; Step 3: After the loading is stable for a few minutes, the displacement sensor (306) and the crack scanner (307) are controlled to move to the set position to perform displacement measurement and crack detection, and the sinking displacement of the supporting pier is obtained by using the sinking monitoring displacement sensor, and displacement data at different positions and crack detection of the entire bottom surface of the simply supported box girder are obtained, and then the next position is changed for detection until all positions are detected; Step 4: Based on the collected data from the displacement sensor and the sinking monitoring displacement sensor, displacement curves under different loading positions are formed, and crack detection conditions under different loading positions are obtained based on the crack scanner.

10. The simply supported box girder static test device according to claim 9, characterized in that: Repeat steps 1 to 4 using different static loads to obtain displacement curves and crack detection conditions under different static loads.

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