Novel vibrating wire type concrete pressure stress meter

Abstract

The invention discloses a novel vibrating wire type concrete pressure stress meter. The novel vibrating wire type concrete pressure stress meter is characterized by comprising a round pressure transmitting body and a wire type pressure sensor connected with the round pressure transmitting body, and the ratio of the thickness of the round pressure transmitting body to the diameter of the round pressure transmitting body is 1 / 15; the pressure sensor comprises a shell, a steel wire fixing part and a steel wire installed on the steel wire fixing part; the round pressure transmitting body comprises an upper pressure transmitting plate, a lower pressure transmitting plate and a pressure transmitting liquid cavity located between the upper pressure transmitting plate and the lower pressure transmitting plate, and the ratio of the thickness of the pressure transmitting liquid cavity to that of the round pressure transmitting body is 3 / 100. The novel vibrating wire type concrete pressure stress meter has the advantages that the round pressure transmitting body is adopted, the ratio of the thickness of the round pressure transmitting body to the diameter of the round pressure transmitting body is 1 / 15, and measured concrete pressure stress error is small due to the structure; meanwhile, the ratio of the thickness of the pressure transmitting liquid cavity to that of the round pressure transmitting body is 3 / 100, and therefore it is guaranteed that the temperature compensation coefficient of the instrument is small; the pressure stress meter of the structure can accurately measure the concrete pressure stress in concrete large in temperature change and size.

Description

technical field [0001] The invention relates to a novel vibrating wire concrete compressive stress gauge, which belongs to the technical field of mechanics. Background technique [0002] The vibrating wire concrete compressive stress gauge currently produced is mainly used for the measurement of the concrete compressive stress of the tunnel concrete lining. The instrument is welded around two rectangular thin plates. The gap between the two plates is extremely small and filled with pressure transmission liquid. The upper plate of the strain gauge is connected with the vibrating wire pressure sensor by a pressure transmission tube. Pressurized tubing (such as figure 1 shown). Embed stress gauges in the concrete lining, or between the concrete and the tunnel wall. Generally, after the sprayed concrete is poured, the temperature drops due to the heat of hydration of the concrete, and a gap is formed between the concrete and the pressure plate of the instrument. At this time...

AI Technical Summary

Problems solved by technology

Although the appearance of this instrument is very thin, due to the large temperature coefficient of the pressure transmission fluid, the temperature compensation coefficient of the instrument is large, so that it cannot accurately and directly measure the concrete compressive stress in concrete, especially in large-volume concrete.

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