Three-dimensional comprehensive slab warping shape monitoring device and implementation method for early cement pavement

Abstract

The invention provides a concrete pavement early-age three-dimensional comprehensive slab warping shape monitoring device and a realization method thereof. The monitoring device comprises a concrete face slab. A cement stabilized base is arranged under the concrete face slab. The cement stabilized base is internally provided with a plurality of cylindrical concrete columns embedded in the upper surface of the cement stabilized base. Each cylindrical concrete column is internally provided with a vibrating-string strain sensor extending from the inside of the cylindrical concrete column to the concrete face slab. An isolation film for preventing vertical deformation of the cylindrical concrete columns and the cement stabilized base is arranged between the cement stabilized base and the concrete face slab. The concrete face slab is provided with 13 measuring points. Each measuring point is provided with a vibrating-string strain sensor. The monitoring device has simple structure, ingenious design, good stability and high precision.

Description

technical field [0001] The invention relates to a three-dimensional full-slab warping shape monitoring device and a realization method for early-age cement pavement. Background technique [0002] Warpage is a typical shape characteristic of cement concrete pavement slabs, which significantly affects the support state of the pavement slab and the stress distribution generated by vehicle loads inside the slab. The study found that the pavement will solidify a specific initial warping shape due to the combined effects of specific construction temperature field, dry shrinkage, and creep in the early age. It has a significant impact, and even causes premature breakage of the panel. [0003] At present, the main technical problem faced by the early-age warpage monitoring of concrete slabs is the overall monitoring of the early-age full-time warpage of large-area thin-slab structures. In the past, dial gauges, deflection gauges, displacement sensors, and surface profilers were us...

AI Technical Summary

Problems solved by technology

In fact, instruments such as dial indicators, deflection gauges, and LVDT displacement sensors need to wait for the concrete to harden to start measuring, and are installed on the surface of the panel. The displacement monitoring process is easily disturbed. Cumulative deformation is difficult. Although the surface profile meter can reflect the relative warping of the panel, it also requires monitoring after the concrete of the concrete panel hardens. Therefore, the sensor in the traditional monitoring method is easily disturbed, has low precision and poor stability, and cannot monitor the cumulative deformation. Real-time monitoring of concrete panel warping shape

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