Study On The Non-destructive Testing Technology Of Anchor Working Load

Slope protection and prestressed bridge are particularly prominent as building expressway in mountainous areas,Meanwhile anchor is currently widely used in reinforcement projects.With the highway stock and broad use of prestressing force bridge,as concealing the project,its anchor makes the detection means of prestressing force but lags behind relatively.Because of people are,geological condition,material, etc.cause the losses of prestressing force to threaten the security of the slope project and science of bridge building seriously,traditional detection means is unable to control effective to thisly,under this kind of state,can't harm the detection technique and become the method to have development prospect most at present.Because of the loss of prestressed anchoring serious threat to the safety of the works result from anthropogenic,geological conditions,materials,and so on,traditional methods can not effectively control this,in such circumstances,the non-destructive testing technology has become the most promising method.This paper use the indoor experiments,theoretical analysis and so on to analyse the testing of the anchor working load based on detailed analysis of the results of previous studies.Initially,this paper analyse the anchor body vibration and stress wave signal analysis method,through the interior of the pilot signal acquisition,verify the stress wave velocity of anchor body changed with an average load changed,finally,derive the function between anchor precursors stress wave velocity and anchor working load,in order to make the corresponding guidance to the anchor work load detection technology. Through a systematic study of this article,the major conclusions as following:1.Detail detect anchor working load indicator has a great significance to the quality of the anchor working load.The anchor working load of Anchor Engineering job directly decide the safety of the works.2.In accordance with the laws of anchor body vibration theory,and the time-reflected signals at the bottom of anchor rod,this paper conslude the length and stress wave velocity of anchor rod.And medium acoustic attenuation and acoustic are closely related,in order to increase the acoustic penetrated ability,choose the lower frequency waves.3.Detection of the signal acquisition is often has a lot of interference components, in order to cover up the characteristics of signal identification,in's necessary to carry out the original signal.Time-domain analysis is based on the timeline for the coordinates of various physical quantities of the dynamic signal waveform with time. Spectrum analysis expressed though the dynamic signal to a frequency axis for the coordinates by Fourier transform.Time-domain expressed image and frank,and it's more concise and more deeply analyze and convenience to express the signal by frequency domain.Look at time-domain signal into confusion,it's clearly to see the signal energy distribution and phase distribution in the frequency domain,to facilitate further processing,such as filtering,phase adjustment,etc.The application of wavelet analysis in time-frequency domain have a very strong signal characterization of the capacity of local features,can be used for signal de-noising,signal detection and analysis,basis for judging for the anchor working load.4.Collect the signals in the interior test are resolved not prestressed grouting status under the inversion,through a variety of signal processing methods for signal processing and velocity General method of calculating the average set up a stress wave velocity and the function of working load.The inversion of equation is v=-2E-05F~3-0.0112F~2-0.1149F+5122.1. Through this equation can be counter-performance anchor working load,provide the basis for safety evaluation of anchor body.