Detection method and detection device for hinged gap of plate-girder-hinged bridge

Abstract

The invention discloses a detection method for a hinged gap of a plate-girder-hinged bridge. The detection method is characterized by comprising the following steps of: providing a resistive displacement gauge; mounting the resistive displacement gauge at the hinged gap, and enabling the vertical relative displacement of plate girders at two sides of the hinged gap to cause the change of a resistance value of the resistive displacement gauge; acquiring a resistance change value of the resistive displacement gauge; judging the vertical relative displacement of the plate girders at the two sides of the hinged gap according to the change of the resistance values, and comparing the vertical relative displacement with an allowable displacement range; judging that the hinged gap is damaged or destroyed if an acquired relative displacement value exceeds the allowable displacement range; and judging that the hinged gap is normal if the acquired relative displacement value does not exceed the allowable displacement range. According to the detection method, a detection device is mounted at the bottom surface of a plate of the plate-girder-hinged bridge, the traffic is not required to be closed, and the vehicular traffic loads can be randomly used, so that the detection can be convenient. With the adoption of the detection method and the detection device, the time and the cost for detection can be saved, the degree of damage to the hinged gap can be accurately detected, and thus, a foundation for the accurate and reasonable determination of a repair scheme is provided.

Description

technical field [0001] The invention relates to a detection method and a detection device for a hinge joint of a hinged slab girder bridge. Background technique [0002] The hinged slab girder bridge is formed by connecting multiple slab girders horizontally with hinged concrete. Such as figure 1 Shown is a schematic diagram of the hinge joint structure of a hinged slab girder bridge, and the hinge joint 3 is between the plate girder 1 and the plate girder 2 . Normal hinge joints 3, help the plate girder to transfer the load. When the load is applied to the plate girder 1, it will be transmitted to the plate girder 2 through the hinge joint 3. The plate girders share the loads imposed on the bridge. [0003] Due to construction quality or long-term use, the hinge joints of hinged slab girder bridges can be damaged or destroyed. After the hinge joint fails, the hinge joint cannot transmit the load. Such as figure 2 Shown is a condition that can occur after a hinged jo...

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Problems solved by technology

[0004] However, in the prior art, it is difficult to find out whether the hing

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