Pre-tightening force dynamic monitoring system for pre-stressed anchor bar strengthening project

Abstract

The invention discloses a pre-tightening force dynamic monitoring system for a pre-stressed anchor bar strengthening project. The system comprises a deformed steel bar, a retainer plate and nuts, wherein one end of the deformed steel bar is provided with an anchorage; the anchorage is combined with soil mass to anchor the deformed steel bar in the soil mass and stretch the deformed steel bar intoa pre-stressed deformed steel bar anchor bar; the outer end of the pre-stressed deformed steel bar anchor bar is provided with an exposed section; the top end of the exposed section is provided with an acceleration transducer and a vibrator; the acceleration transducer is connected with a tensile force detector of the pre-stressed deformed steel bar anchor bar; and a signal acquisition device, a signal analyzing device, a calculating procedure chip, a rechargeable battery and a control main board are built in the detector; the technical scheme overcomes the defects of high use cost, inconvenient operation and maintenance, low testing accuracy, narrow application range, failure of the anchor bar and the like existing in a conventional detection method; and the pre-tightening force dynamic monitoring system is suitable for instantaneous detection and whole-process monitoring of the tensile force of the pres-stressed deformed steel bar anchor bar in the large-area projects of instable soil mass slope, retaining wall, deep foundation pit and the like strengthened by the pres-stressed deformed steel bar anchor bar.

Description

technical field [0001] The invention relates to a pre-tightening force dynamic monitoring system of a pre-stressed bolt reinforcement project. Background technique [0002] Bolt anchoring technology has developed rapidly in anchoring engineering, and has been included in the national key scientific and technological research plan during the "Eighth Five-Year Plan" and "Ninth Five-Year Plan". With the vigorous development of infrastructure construction, extensive high filling and deep excavation make prestressed anchorage technology particularly important. It is an active support measure, and the active pressure provided to the rock and soil mass can effectively limit the The deformation of the slope while maintaining its stability greatly improves the stress conditions of the support structure, not only reduces the weight of the structure itself, saves engineering materials, but more importantly, in the area where the side limit is strictly limited, the support adopts Prest...

AI Technical Summary

Problems solved by technology

However, there are many detection methods at present, such as detection methods such as installing sensors, attaching strain gauges, rod body drilling sound wave ranging, and oil meter control methods; the aforementioned sensor detection methods use a large number of sensors, and the cost is high for larger projects. Too high, only suitable for scientific research; the aforementioned detection method of sticking strain gauges is cumbersome to operate, interferes with construction and inconvenient, cannot be reused, and is only suitable for small-scale scientific research; , and the initial length needs to be measured, and the end face is required to be flat, the operation is cumbersome, and the accuracy is not high; there is also the oil meter control method, which is rough in judging the loss, and its accuracy is low, and it cannot monitor the prestress of the bolt for a long time

In addition, the detection method of the vertical prestressed tendon tension of the concrete box girder bridge web is based on the characteristics of the concrete box girder bridge and uses corrugated sleeves to pre-embed holes. Affect the test accuracy; the calculation program only has the calculation equation of the vertical prestressed anchorage system, which is not suitable for bolt detection; the test device of this detection method is complicated, the integration level is not high, and more auxiliary devices must be equipped on site to work

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