Application Research On High Strain Measurement Of Bearing Capacity In The Detection Of Prestressed Pipe Pile

Pile Foundation has a long history in our country, is a very extensive form an important foundation. In high-rise buildings, roads and railways, large bridges, heavy plant, port, offshore oil platforms, nuclear power plants and other important projects that are widely used.Pile belong hidden works, once the pile foundation accident, will be more difficult to deal with them, quality testing pile becomes a key construction project quality control. Quality testing pile contains two aspects of capacity and integrity, is a major issue to determine the carrying capacity of the engineering sector. Prestressed Piles material cross-sectional area is more consistent than other high-pile type closer Strain pile of soil mechanics model assumptions, so there will be a high-strain method theoretically test prestressed pipe pile bearing capacity than the other type higher accuracy. Its depth research and analysis, help to improve accuracy and stability, high strain detection method as an effective supplement and partially replace static load test, saving time detection, improve the detection efficiency, saving testing costs, with high practical values and social and economic benefits.Firstly, the theory and the theory of traveling wave high strain method was derived, in-depth understanding of CASE method and test waveform fitting calculation principles, based on the values of Jc values issues were discussed in depth, using a different behavior according to curve Jc values to determine a method used in engineering instance, achieved satisfactory results; fitting the measured waveform was elaborated, on this basis, taking the key parameters surrounding soil of piles and piles subsoil limits bomb bomb limits value issues were discussed in detail; secondly field testing technology is essential for high-strain method, precise operation to obtain a relatively accurate measurement curve, the paper all the key aspects of the field test were discussed in detail, to find out the impact of the test results The key aspects of accuracy, and propose solutions, in order to improve the accuracy of high-strain calculations made a strong guarantee; Finally, dynamic and static comparative test instances dozen or two projects to validate pile high strain CASE method and measured waveform Quasi legitimate for prestressed pipe can get high accuracy test results and verify Jc values used in this paper a new method to determine the pile side soil proof value and the value of the correctness of the pile subsoil.