Device and method for measuring inner stress of concrete

Abstract

The invention provides a device and method for measuring the inner stress of concrete. The device comprises two hemispherical shells, wherein a left hemispherical shell, a right hemispherical shell and a force measuring steel ring are assembled together to form a spherical cavity, the force measuring steel ring is provided with rubber-based strain foils, the spherical cavity is provided with signal acquisition boards, the rubber-based strain foils are connected with the signal acquisition boards through lead wires, and the signal acquisition boards are connected with signal transmission lines. The device is buried in a concrete structure; a plurality of rubber-based strain foils are adhered to an inner surface of the force measuring steel ring at equal intervals; a surface stress cosine function curve of the force measuring steel ring is fit according to a stress value measured on the surface of the force measuring steel ring; and the direction and magnitude of a primary stress of the concrete are measured according to a phase angle and an amplitude of the function curve. The device and method for measuring the inner stress of the concrete provided by the invention can be used for overcoming the defects of difficulty in the bury and positioning as well as poor data reliability of the traditional strain gauge for monitoring the stress of an inner structure of the concrete, and is particularly suitable for measuring the stress state of the inner part of a large-volume concrete structure.

Description

technical field

[0001] The invention relates to a measuring device for internal stress of concrete and a measuring method thereof, belonging to the field of measuring concrete stress. Background technique

[0002] During the construction of concrete dams, in order to monitor the safe operation status of the dam after the dam is completed, it is necessary to bury concrete strain gauges inside the dam, and the stress state inside the concrete can be obtained by solving the monitoring data of concrete strain. At present, various types of strain gauges and strain gauge groups composed of strain gauges are widely used in the stress monitoring of concrete dams. A single strain gauge embedded in the concrete can measure the strain of the concrete along the direction of the strain gauge. To monitor the stress state of a certain part of the concrete structure, multiple strain gauges must be arranged and buried in a specific direction. For different arrangements Different calculation...

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