Vertical displacement monitoring device and method for initial large height difference structure

Abstract

The invention discloses a vertical displacement monitoring device and method for an initial large height difference structure. The device comprises a measuring point liquid storage tank filled with liquid; and a pair of measuring end liquid storage tanks, wherein through holes passing through the exterior are correspondingly arranged at the same height of the upper part, and the bottoms of the pair of measuring end liquid storage tanks are connected by a first connecting pipe as an integrated structure; the first connecting pipe is provided with a first valve; the bottom of one measuring end liquid storage tank is also communicated with the measuring point liquid storage tank through a second connecting pipe, and the upper surfaces of the pair of measuring end liquid storage tanks have same openings. The device also comprises a differential pressure sensor, wherein the negative electrode end and positive electrode end are communicated with the openings of the measuring end liquid storage tanks in a seal manner through pipelines, respectively. The device provided by the invention and the method for the measurement by the device successfully eliminate the influence of the initial height difference on the automatic monitoring of the sub-millimeter vertical displacement and effectively avoid the influence of temperature and atmospheric pressure on monitoring results.

Description

technical field [0001] The invention relates to the technical field of civil engineering. More particularly, the present invention relates to an apparatus and method for vertical displacement monitoring of an initial large-height difference structure. Background technique [0002] Since the range of the pressure sensor is limited, it can generally still meet the measurement of the relative change of the vertical displacement of the structure. However, in the process of engineering practice, there are some structures, the initial height difference of each structural part reaches several meters, tens of meters or even more than 100 meters, but the relative change of vertical displacement is very small, and some are only millimeters or even submillimeters. The problem is the small deformation monitoring problem of the initial large height difference structure, such as the vertical deformation problem of the main arch structure of the arch bridge, the vertical deformation probl...

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Problems solved by technology

[0003] The current existing technology and related equipment, such as precision level, total station, photoelectric deflection meter and GPS, etc. are difficult to meet this requirement: (1) Displacement methods such as hundred (thousand) submeters, optical levels such as level and total station Instrument measurement methods are all short-term and manual measurements, which have disadvantages such as time-consuming and manpower-consuming, poor real-time performance, and need for fixed points near the measurement points.

(2) The inclinometer method, laser image method, GPS, inertial measurement method, photoelectric liquid level connecting pipe method, pressure transmitter method, tension line method, etc. can all realize automatic measurement, but there are deficiencies in all of them. For example, the inclinometer method requires It is not easy to install the axis parallel to the bridge axis; the image method is seriously affected by atmospheric visibility, and it is difficult to work normally in poor visibility weather such as rain, fog, and haze; GPS has low accuracy in the vertical displacement direction and is easily blocked by components. At present, it is only applicable to the vertical displacement monitoring of large-span structures; the inertial measurement method has distortion phenomenon for low-frequency displacement and cannot measure vertical static displacement; The frictional resistance of pipelines and the atmospheric field with time-varying characteristics reduce the test accuracy and long-term stability, and it is difficult to consider the influence of temperature changes, and the cost of equipment is high. It is difficult to meet the small deformation test of structures with initial large height difference characteristics. The required ultra-large range and high precision, and the high requirements for the verticality of construction and installation, that is, the environmental adaptability is weak; the precision of the tension line method is low, the test process needs complex calculations, and the structure is complicated and the cost is high. It is difficult to arrange and meet the requirements for effective monitoring of the vertical displacement of such structures

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