A kind of deflection automatic measuring device and measuring method

Abstract

The invention discloses a precision deflection automatic measuring device and a measuring method. The precision deflection automatic measuring device comprises a closed water cylinder, a water connection cylinder, an installation rack, a suspension shaft, a hanging plate, a lever frame, a center circular pipe, a fixed disk, a sensor and a strain gauge. The installation rack comprises a bottom plate and stand columns. There are two stand columns. The two stand columns are arranged on two ends of a center of the bottom plate at intervals. Upper ends of the two stand columns are connected to thesuspension shaft. The lever frame is formed by at least two plate materials. A center portion of the two plate materials is movably connected to the center circular pipe through a bearing. The two ends of the lever frame are symmetrically provided with the closed water cylinder and the water connection cylinder. One end of the sensor is connected to the fixed disk fixed to the center circular pipe, and the other end is fixed with one plate material of the lever frame. The sensor is connected to the strain gauge, and the strain gauge is connected to a computer. In the invention, a connecting pipe and two-force lever frame principle and a strain measurement technology are integrated; measurement accuracy is high and operation is convenient and simple; and the device and the method can be widely used for vertical displacement monitoring of a bridge, a building, engineering, slope protection, a foundation pit and the like in long-term construction processes.

Description

technical field [0001] The invention relates to a deflection measuring device, in particular to a precision deflection automatic measuring device and a measuring method. Background technique [0002] At present, an important content in the structural load test is the measurement of the deformation (deflection) of the structure under load, which reflects the stiffness characteristics of the structure. At present, the deflection tests are mainly divided into the following categories: [0003] 1. Level or total station. The principle is to pre-arrange a number of fixed measuring points on the structure, place one point on a certain fixed point or a relatively fixed point, and then use the level to read the height of each tower foot after each loading according to the principle of leveling. Elevation, the deflection at this place can be obtained after subtracting the front and back. The advantage is that it can carry out multi-point measurement, no need to install a base or b...

AI Technical Summary

Problems solved by technology

However, in the current use process, the device using this method also has certain shortcomings. For example, the Chinese utility model patent with the patent number 01209421.8 uses a straight tube to install a ruler for manual reading, so the accuracy of this instrument does not exceed 1mm.

For those using photoelectric sensors for reading, such as utility model patents with patent numbers 200320127308.X and 200420013598.X, due to the influence of water surface tension and no amplification function, their accuracy and stability need to be improved.

[0007] In addition, the Chinese patents with patent numbers 201120026894.3, 200810237453.0, 200810237454.5, 200910273439.0, and 200920005141.7 all use micro-pressure sensors or pressure transmitters to measure the water column pressure, because the water column pressure changes extremely small, and the connector is divided after multiple pipes. , the water pressure is smaller, so it is difficult to achieve the ideal accuracy requirements

[0008] There is also the conversion of liquid level displacement using buoyancy or float, and the change of buoyancy or float displacement is sensed by elastic elements or photoelectric sensors, such as Chinese patents 201110204309.9, 201120258359.0. This type of technology has the problem of secondary conversion, as well as the friction and verticality of the float. and other issues, so its accuracy and linearity cannot meet the requirements of existing applications

[0009] In short, because the existing technology does not amplify the liquid level displacement or pressure or buoyancy, and directly measures these quantities, even if a very precise grating sensor, photoelectric sensor or micro-pressure sensor is used, its accuracy is difficult to meet the requirements of structural deflection measurement

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