Magnetic suspension type bridge main tower pylon top displacement measurement device and measurement method thereof

Abstract

The invention discloses a magnetic suspension type bridge main tower pylon top displacement measurement device, which is mainly formed by a magnetic suspension rail, a shielding sleeve and an adjustable horizontal installation base. According to the device, based on a magnetic suspension principle, the magnetic suspension rail is utilized for providing a constant vertical force for a suspension mass block, so that the suspension mass block is suspended above the rail, a fixed point in a main tower pylon top displacement test is formed, the magnetic suspension rail, the shielding sleeve and the base are horizontally move along with bridge pylon top displacement, and the bridge pylon top displacement can be obtained through measuring the change of a relative horizontal distance between the suspension mass block and the shielding sleeve. The magnetic suspension type bridge main tower pylon top displacement measurement device provided by the invention is applied in the bridge main tower pylon top displacement test, so that an external fixed point has no need to be set, and the absolute displacement of a bridge main tower pylon top can be accurately measured; the dynamic measurement of the pylon top displacement can be realized, and the device can be widely applicable to the technical fields of bridge load tests, health monitoring and the like. Accordingly, the inventor also builds a corresponding measurement method.

Description

technical field [0001] The invention belongs to the technical field of bridge horizontal displacement measurement, and in particular relates to a magnetic suspension type bridge main tower top displacement measurement device and a measurement method thereof. Background technique [0002] In long-span bridges such as cable-stayed bridges and suspension bridges, the bridge tower is an important load-bearing component, and the horizontal deviation of the bridge tower top is an important indicator reflecting the stress state of the whole bridge. In the load test detection, construction control and bridge health monitoring of cable-stayed bridges and suspension bridges, the top deflection of the main tower is an important measurement index. Measuring the deflection value is an important key to understand the stress state of the structure and ensure the safety of the structure. link. [0003] Common methods for testing the top deflection of the main tower include the total statio...

AI Technical Summary

Problems solved by technology

The total station method needs to set a fixed reference point with constant horizontal coordinates outside the bridge, and then use the total station to measure the horizontal coordinate change of the tower top relative to the fixed reference point, and use the geometric coordinate relationship to calculate the horizontal offset value of the tower top. However, total station measurement requires manual point alignment and manual observation, and the accuracy is affected by atmospheric, environmental and human factors

The GPS method is to use the GPS network, set up a GPS receiver on the top of the tower, and calculate the coordinates of the points to get the horizontal deviation of the tower top. Although the GPS method can realize automatic measurement and does not need to set a fixed reference point outside the bridge, However, the horizontal accuracy can only reach the 5mm level, and it cannot meet the engineering needs when the deviation is small, and the price of GPS measuring instruments and equipment is very high. The unit price of one measuring point is tens of thousands of yuan, and the whole system needs hundreds of thousands of yuan.

For this reason, it is very difficult to measure the top deflection of the main tower of cable-stayed bridges and suspension bridges at low cost, accurately and quickly, and it is also a major technical problem in the field of bridge inspection engineering at present.

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