Apparatus for measuring structure horizontal displacement relative to roadbed

Abstract

The invention discloses an apparatus for measuring structure horizontal displacement relative to roadbed. The apparatus comprises that: a displacement sensor which is fixed at a structure test point, wherein, an end portion telescoping pull bar of the displacement sensor connects with a near end of a reference rod, and a far end of the reference rod is anchored on a roadbed; a temperature correction displacement sensor which is fixed on the roadbed and is farther than the far end of the reference rod, wherein, an end portion telescoping pull bar of the temperature correction displacement sensor connects with a near end of a temperature correction rod, and a far end of the temperature correction rod is anchored on the roadbed; wherein, lengths, specifications and materials of the reference rod and the temperature correction rod are fully same, models, measuring ranges and precision of the displacement sensor and the temperature correction displacement sensor are fully same, and a test value of the temperature correction displacement sensor realizes correction of a displacement sensor test value. The measuring apparatus has the characteristics of a small measuring error, high precision, and easy installation, and can be used for a displacement test of a structure which is constructed and operated on a railway or a road.

Description

technical field [0001] The invention relates to a device for measuring displacement of geotechnical engineering structures, in particular to a device for measuring horizontal displacement of structures relative to roadbeds. Background technique [0002] Subgrade engineering is an important part of railway and highway engineering. In order to meet different functional requirements, it is necessary to build different forms of structures at specific positions on the subgrade, such as abutments, culverts, retaining walls, anti-slide piles, etc. During the construction and operation of railways and highways, the structures at specific positions on the subgrade will be subject to loads and environmental factors, resulting in displacement. When the horizontal displacement of the structure relative to the subgrade exceeds the control limit, the long-term use function of the subgrade and the structure will be seriously deteriorated. In order to grasp the displacement development of ...

AI Technical Summary

Problems solved by technology

The existing horizontal displacement measurement devices for retaining walls, abutments, anti-slide piles and other structures relative to the subgrade, the common inclinometer, the test principle is based on the embedded in the structure and the stable soil layer of the foundation The angle between the axis of the inclinometer tube and the vertical line changes to obtain the horizontal displacement value of the structure. The test error is large due to the cumulative effect. The systematic error within the length range of the 30m inclinometer tube can reach 8mm, and the test accuracy It cannot meet the requirements for accurate testing of structural object displacement during the construction and operation of ballastless track high-speed railways, especially the requirement that the horizontal displacement control value of the ballastless track end spine structure of high-speed railways is 3mm

In addition, inclinometer testing requires on-site manual work to complete data collection, and it is difficult to realize automatic monitoring. Due to the special location and environment of many engineering structures, such as high altitude, low temperature, thin air and difficult to reach structures The position of the measuring point of the object, etc., has brought great difficulties to the displacement test and data acquisition.

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