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Specific Content and Current Situation of (I) Bridge Engineering Detection Skills
1. The primary content of bridge engineering detection skills

The detection skills of bridge engineering involve a wide range of contents. The specific contents of the detection include the basic detection, the defects of bridge appearance and the special detection of bridge structure. At present, the vast majority of bridge surface defects are still detected and evaluated by manual visual inspection. This single-worker estimation method lacks both accuracy and skill accuracy. The structural shortcomings of various bridges have the following aspects:
① The size of the defect, and its distribution;
② The orientation and direction of the specific attack defect;
③ Grasp the change of shortcomings and the situation of its development. First of all, what we want to do is to analyze and find out the causes and nature of the shortcomings according to their specific characteristics, and also to analyze the possible degree of harm. Secondly, according to the specific situation, the structure needs to be repaired or not. If it needs to be repaired, a reliable and feasible repair plan should be worked out as soon as possible. For the special detection of bridge engineering structure, the first need to detect the various components of the bridge, and specific inquiries and evaluations should be made about its bearing capacity and skills. The detection of the foundation is primarily the detection of the bearing capacity of the bridge's foundation structure and its integrity.
2. The current situation of bridge engineering testing skills at home and abroad

Now, after continuous exploration and research, some scholars at home and abroad have made new progress in the detection skills of bridge engineering, and have explored more systematic and applicable methods in the detection of bridge structure. For example, they have accumulated some theoretical and practical experiences about sensitive parameters in bridge detection structure, and can effectively use the data obtained from these practices, the accounting model is corrected. This type of exploration primarily uses forced oscillation and ambient oscillation tests to analyze the speed, weight, and road conditions of the vehicle. In addition, the mimetic parameters of the bridge structure are detected, and the influence of the bearing ability of the whole bridge structure is concerned. Also invented for the dynamic coefficient, vibration and oscillation frequency of various dynamic characteristics and structural characteristics of the parameters of a series of testing skills and methods. In the root detection method, scholars have also been numerous through theoretical and practical research and verification, and then summarized the dynamic side principle as the root, on the integrity of the pile root and its carrying capacity of the inspection method. The separation includes: high and low strain method, acoustic transmission method; high strain and single pile static load test and so on. At present, the first choice for its integrity detection skills is the sound wave projection method. Of course, sometimes the low strain method and the drilling method are also used. However, the drilling method is mostly used to detect the integrity of the length, strength and bottom thickness of the concrete of the wooden pile, and to identify the top rock and soil quality of the wooden pile.

The Primary Method and Existing Problems of (II) Bridge Pile Foundation Detection

With the gradual increase of bridge engineering, many applications of pile foundation are naturally indispensable. It is regarded as the foundation of bridges. Therefore, the quality inspection of pile foundation is particularly important, which has naturally become more and more people. The reason for concern. The detection of bridge pile foundation is to ensure the quality of pile foundation and ensure the safe use of bridges, which is of great significance to protect people's lives.
1. Bridge pile foundation detection methods
At present, the testing methods we have chosen for bridge pile foundations are mainly dynamic testing and core drilling. The dynamic measurement method can be divided into two methods (sound wave transmission and low strain method). The former is to determine whether the acoustic parameters are abnormal and whether the pile foundation is qualified or not. The latter is whether there are significant shortcomings in the frequency domain and time domain signals in the wooden pile. And judge the eligibility of its pile foundation.
2. Problems Existing in the Application of Bridge Pile Foundation Detection Skills and Identification Specifications
Some of the reasons for non-detection skills, the occurrence of false or omission discrimination will form a bridge engineering quality safety problems. Together, the professional skill level of bridge engineering inspection personnel cannot be on a plane, then. There will inevitably be differences in understanding the quality of testing methods and specifications, which leads to significant T-point discrimination errors in the quality of pile foundations of testing results. Now the bridge construction in various regions of the country, although the pile foundation of the bridge has been tested, but because of its identification specification, there is no clear rule in the quality range, and the individual's grasp of the quality specification inspection and evaluation is not the same, the results will be very different.
In this paper, the author of a lot of literature research, coupled with their own knowledge in this regard, the quality of the pile on the identification of the specification is divided into several categories:
① Intact pile foundation: during testing, the dynamic waveform is regularly attenuated, the waveform is normal, and the strength on the mixed suspicion reaches the rules and specifications.
② relatively intact pile foundation: during testing, the dynamic waveform has a small range of deformation, the pile body is not as good as the intact pile, there will be some minor shortcomings, the wave velocity and strength are normal, and the design specifications can be achieved.
③ Pile foundation with significant shortcomings; dynamic waveform-generally, there will be more significant irregular shaking, pile body has significant cracks and mud, etc., the strength of this pile body usually does not meet the rules and specifications. When using its carrying capacity to test, and then according to the specific situation to decide whether to use.
④ Pile foundation with severe defects; the dynamic measurement waveform appears very irregular change and shake, the phenomenon of mud clamping is severe, and even the pile is broken. Such piles should be treated accordingly and cannot be used in general. Although the analysis of pile foundation types is more detailed, sometimes it is still difficult for us to accurately grasp and distinguish each type of pile foundation. There are still some problems with accuracy in testing.

(III) Bridge Engineering Testing Skills to Carry out Love Brother and Prospect for the Future
1. Bridge detection skills development stage
The history of the development of bridge detection skills has gone through three stages:
① Professional expert-level figures rely on their own theoretical and practical experience and professional skills for sensory testing, and do simple operation and processing of the obtained information and data;
② This stage is to use dynamic waveform detection methods and signal sensing skills. Now this skill has been widely used in bridge engineering detection skills and has become the primary detection method.
③In recent years, in order to better detect large and medium-sized bridge projects, the skills of bridge engineering detection have entered the third stage, which is a three-body intelligent detection method that integrates knowledge processing, signal processing, and data processing., This method is gradually becoming the mainstream of bridge engineering detection skills.
2. The future direction of bridge engineering skills
① The data collection system through radio communication methods will be announced as soon as possible and applied to practice. The ability to get used to sensor testing skills such as wind loads and traffic loads is announced in order to collect relevant data more quickly, accurately and conveniently.
② Assemble a system that can carry out active damage identification, and timely and quickly carry out active identification and response detection reports.
③ Apply the advanced skills of modern network system to the bridge engineering detection skills system, combine both, give full play to their respective advantages, and then achieve the sharing of network skills resources.
④ Establish a complete data calculation database for all links from design, construction to operation, so as to facilitate calibration and safety inspection at any time.
It can be predicted that the future research and exploration on bridge engineering detection skills will continue, and the system research direction will be carried out in many aspects such as extending the service life of the system and enhancing its reliability, so as to reduce the unsafe factors in bridge engineering as much as possible, thus ensuring the quality of bridge engineering.