Design And Implementation Of An Improved Pile Foundation Quality Evaluation System

The pile foundation is the foundation of the building structure,and its quality directly determines the safety and stability of the overall structure.The pile foundation of a large building structure with a diameter of several meters and a depth of tens of meters often causes defects in the quality of the pile due to reasons such as hole wall collapse and pile bottom sedimentation during the process of hole digging and concrete pouring.Detecting and evaluating the quality of piles is a very important issue in engineering,but due to environmental and non-destructive factors,there is still no very accurate and effective detection method and method.The core-drilling method is a method widely used in engineering for quality inspection and evaluation of large pile foundations,but its drilling speed information during the drilling process is not recorded and used for the quality evaluation of pile foundations.Aiming at the core drilling equipment commonly used in the current engineering,and considering the complex working conditions on site and the current status of the operator’s quality in actual applications,this paper designs a method to collect the drilling speed information during the core sampling process and use it to improve the current piles.Drilling data acquisition and recovery system based on defect detection and quality assessment.The specific work of the thesis is as follows:Aiming at the problem of data collection,this paper designs an embedded field drilling data collection device.Considering the working principle of the existing commonly used core drilling equipment,combined with factors such as the on-site construction environment and the quality of the drilling workers,a displacement measurement method was selected.Through the perception of the external environment by the vibration sensor and the three-axis acceleration sensor,the field drilling data was realized Non-contact intelligent collection;for the traceability problem in the data recovery process,an index catalog-style data storage structure is designed.By creating an index catalog at the beginning of each drilling,batching of data is realized Storage;At the same time,in order to facilitate the management of the collected data,a QTbased host computer tool is designed to realize the export and local storage of the data.In order to obtain the drilling speed information and use it to improve the quality assessment of the current pile foundation,this paper designs a drilling data recovery algorithm.This method first uses the least squares fitting method to smooth the data.Secondly,the validity of the data is judged by comparing the relationship between the slope and the set threshold,and the valid data is marked according to the magnitude of the slope.Finally,according to the corresponding relationship between the drilling speed and the depth,the data is visualized and restored in two dimensions.On this basis,this article tests the basic functions of the embedded field drilling data acquisition device such as data acquisition,analysis,storage,and forwarding,and verifies the stability of its work when it is re-powered after an abnormal interruption.At the same time,the data recovery effect of the algorithm proposed in this paper is tested,and it can be found that the recovered two-dimensional data can clearly reflect the change of the drilling speed information during the drilling process,and can be used as an important reference for the quality evaluation of the pile foundation.