No matter in study or work, everyone will inevitably come into contact with papers. The process of writing a thesis is the process that people gain direct experience. Do you know how to write a good paper? The following is my carefully arranged paper on bridge engineering. Welcome to read the collection.

Bridge engineering paper 1 1, basic theory and method of risk assessment of bridge engineering projects.

1. 1 General process of risk assessment

The usual risk assessment process is as follows: analyze and identify risk factors, so as to predict possible risk factors and events in the future, and conduct in-depth and comprehensive demonstration of identified risks through quantitative and qualitative methods, so as to classify risk factors, as well as the probability and distribution of different risks. The degree of harm of various risks. Using the individual and overall risk assessment standards, this paper analyzes the individual project risk and overall project risk respectively, and analyzes whether it is acceptable, so as to formulate scientific and effective solutions or make scientific adjustments to the project.

1.2 basic theory analysis of risk assessment The main risk assessment theories mainly include: risk identification, risk assessment, risk assessment and decision-making.

(1) risk identification

It is to use scientific methods, approaches and measures to comprehensively and objectively judge and understand risk factors and implement quantitative identification. Bridge structure and construction are relatively complicated. In the case of limited information, we can estimate and analyze it through expert interviews and questionnaires to find the core risk factors.

(2) Risk assessment

Risk estimation is also one of the risk assessment models, which is embodied in evaluating the probability of any risk and the possible impact. It includes two main points: probability estimation and loss estimation. Firstly, the probability estimation is calculated and analyzed by doing experiments and using scientific statistical theory. We can also decompose events into basic events according to the principle of probability and calculate them in the form of analysis. The final probability value obtained by these two methods is objective and practical, and is not influenced by anyone's subjective consciousness, so it can be called objective probability. In the actual risk assessment of bridge engineering projects, there is often insufficient information, so it is difficult to make accurate prediction, calculation and analysis, and it is also difficult to obtain accurate probability estimation. Most of them are subjective probabilities, which easily lead to deviation from objective reality. Therefore, the most important thing in practical work is to improve the objectivity of estimation. Second, loss estimation has not been put on the agenda for many years. However, it is actually very important for bridge engineering projects. Usually, losses are scientifically divided into several small categories, including direct losses, indirect losses, personal injuries, environmental losses and so on. , and then calculate the specific values of different losses respectively. This can accurately calculate the number of losses, but it is difficult to operate and execute. We might as well keep the method mentioned above, that is, hire experts to make scientific prediction and analysis with their skills, knowledge and experience, and then adopt scientific calculation and operation methods to improve the objectivity of estimation.

(3) Risk assessment

On the basis of risk identification and estimation, bridge engineering projects begin to carry out risk assessment, create a comprehensive risk rating model, focus on the analysis of risk probability and consequences, and calculate the risk value of the whole system. Refer to the risk acceptance regulations and evaluation indicators, comprehensively analyze and evaluate the risks of the system, and analyze whether the risks of the system are tolerable. At the same time, scientific risk coping strategies and solutions are put forward to ensure that bridge construction can be carried out within the scope of safety risks. The commonly used risk assessment methods mainly include: weighing method, thorough avoidance method, comprehensive risk assessment method and so on. However, the construction of bridge engineering is a very complicated work, which will be affected by many factors and conditions. Among them, comprehensive method can produce better effect and significance, and comprehensive analysis of risk factors must be carried out for bridge engineering projects. First of all, relying on expert investigation and analysis, the risk probability and possible losses caused by different factors are clearly defined. Secondly, the weight coefficient is determined by referring to the status and importance of different factors. Secondly, based on the comprehensive evaluation algorithm, the membership degree is combined with the weight coefficient, and finally the risk is calculated.

(4) Risk decision-making

The ultimate goal of all risk identification, estimation and calculation is to pave the way for scientific decision-making, control risks through effective decision-making methods, reduce the harm of risks, scientifically select decision-making schemes according to risk evaluation indicators, obtain the most suitable optimal scheme, and ensure its implementation.

2. Risk assessment process of bridge engineering project

Comprehensively and deeply analyze and master the project to be put into construction, clarify the basic information, and widely collect relevant information, such as project location, design information, meteorological conditions, geological conditions and other information.

(1) Hierarchical units and research topics of classified planning evaluation.

(2) Classify and divide the future risk accidents predicted by different evaluation units.

(3) Summarize and discuss the causes, probabilities and possible consequences of different accident risks.

(4) Select the method of combining quantitative analysis and qualitative evaluation to evaluate and evaluate the risk accidents.

(5) According to different types of risk accidents, scientific control methods and strategies are given.

(6) Assess and evaluate the risks of different evaluation units.

(7) Concentrate the evaluation of different evaluation units, and finally form the overall risk evaluation.

(8) Get the final summary and experience.

(9) Develop a risk assessment report. .

3. Basis for risk identification of bridge engineering projects

Risk judgment and identification is a complicated and tedious work, which needs to go through many links and involves many complicated work. It has become a necessary prerequisite for project risk management. In order to comprehensively and thoroughly predict the risks of bridge projects, it is necessary to make clear the basis of project risk identification. For the bridge project, mainly from the following points.

(1) Work experience

In order to accurately, comprehensively and objectively identify the risks of engineering projects, it is necessary for engineering project personnel to have comprehensive and rich experience, actively absorb and listen to other people's ideas and suggestions on the basis of their own existing work experience, so as to make scientific and reasonable choices. Risk identification personnel must be good at combining previous work experience and incorporate the risk factors that have been successfully identified to enhance the certainty of risks.

(2) Planning data

Risk assessment, prediction and management are inseparable from the support of some planning materials and programmatic documents. Only in this way can we make a preliminary scientific and reasonable prediction. The risk management planning of engineering projects includes many aspects, such as risk identification, personnel arrangement, organization and planning. The planning of bridge projects also covers many aspects, such as project investment and construction speed. These two planning documents can provide a basis for risk identification and evaluation, thus promoting the scientific, perfect and smooth progress of risk identification.

(3) Classify the risks of bridge engineering projects.

There are many risks in bridge engineering projects, and different risks will affect and restrict each other. In order to effectively control risks, different risks should be classified and divided, and the types, causes and possible consequences of different risks should be clarified, so as to adopt effective solutions and coping strategies, reduce the occurrence or occurrence of risk factors and create more considerable economic benefits.

4. Summary

Bridge engineering project is a complex engineering project, in which there are many complex risk factors. In order to effectively contain risks, control the probability of risks and reduce the losses caused by risks, it is necessary to clarify the practical methods of risk assessment of bridge engineering projects and choose scientific and reasonable risk assessment procedures to improve the operation efficiency of engineering projects and obtain higher economic benefits.

With the development of China, highway bridges have become an important transportation hub, providing a broad channel for China's trade and economic exchanges, and playing a very important role in China's economic development. Therefore, China has invested more manpower and material resources in the construction of highway bridges to ensure the quality of highway bridges to the greatest extent. At present, there are still many problems in the quality control of highway bridge construction, and the related construction technology is not very mature. In this paper, these main problems are analyzed, and a scientific and reasonable optimal control scheme is put forward in combination with professional knowledge, so as to make its own contribution to promoting the cause of highway bridges in China.

Keywords: highway bridge engineering; Main problems; Quality; Management countermeasures

At present, China attaches great importance to the construction technology and quality of highway bridges. I think the two are complementary. Only by improving the construction technology can the construction quality of highway bridges be fundamentally improved. Therefore, we should deeply understand these two shortcomings, so as to solve the problems and promote the stable and sustainable development of highway bridges in China.

1, the main problems in the construction of highway and bridge engineering

1. 1 The bearing capacity of the highway bridge is weak.

China's population is constantly expanding, and people's economic ability is also constantly improving. More and more people have bought private cars, and the number of vehicles passing through roads and bridges has increased year by year. Everything has its own maximum tolerance, and highways and bridges are no exception. Long-term overload use has greatly shortened the service life of bridges and highways, and its quality has also caused great security risks in use. However, the carrying capacity of highway bridges is relatively low, which can not meet people's needs and has a certain impact on people's traffic order. The weak bearing capacity of highway bridge is closely related to its construction technology, which is the embodiment of inadequate construction technology. Irregularities and all minor problems in the construction process will be amplified in time, and the construction technology in the later maintenance work is not in place, which will also shorten the service life of bridges and highways. If some pavement diseases are not treated in time, it will also lead to changes in the structure of the whole highway or bridge. Once subjected to strong external forces, it will easily lead to collapse accidents and bring hidden dangers to people's personal safety.

1.2 highway bridge construction technology is single and unskilled.

Although China's highway bridge technology has been developed for a long time, China's closed-door policy in ancient times led to the lag of highway bridge development, which also had a certain impact on China's current highway bridge technology. The construction technology of highway bridge is still single, and the construction personnel in our country are relatively inexperienced in highway bridge construction with high terrain, which leads to the unskilled construction technology in the actual construction process and delays the construction period. The treatment technology of building materials in China is not very developed, and the strength and viscosity of concrete are not scientifically designed according to the site environment, which leads to poor quality of highway bridges. For highway and bridge projects in mountainous areas, our builders lack anti-seismic awareness, and natural disasters will bring great losses to people's property and life safety.

1.3 Anti-seismic and anti-settlement technology in highway bridge construction

In mountainous areas with rugged terrain, attention should be paid to earthquake prevention and settlement prevention when building highway bridges. Because of the high terrain in mountainous areas, the construction itself is difficult, and natural disasters attack more than the plains. Therefore, materials with strong earthquake resistance should be selected in building materials to improve the quality level of highway bridges themselves. Rainwater is also abundant in mountainous areas, which easily leads to the formation of soft subgrade and damages highway bridges. If this happens for a long time, the whole foundation will sink and the overall road surface of the highway bridge will be lower than the surrounding road surface. Therefore, strengthening earthquake prevention and settlement prevention can effectively prolong the service life of highway bridges and improve the quality to some extent.

2, highway bridge quality management countermeasures

2. 1 Improve the quality management system of highway bridges

Although the quality management system of highway bridges in China is not very mature at present, our enterprise needs to make rigid regulations on the places that are prone to problems in the project, so that the technical quality can be guaranteed. Enterprises should not only do a good job in the quality of highway bridges, but also always care about the interests of construction workers. Under the premise of ensuring their due interests, they can work without burden, be proactive, be easy to communicate in management and actively improve their operational skills. For the unqualified parts in the construction, the corresponding construction personnel should be fined, so that the rewards and punishments are clear, which is conducive to strengthening the quality construction of highway bridges.

2.2 strengthen the management of construction site layout

Due to the huge amount of highway bridge construction, all kinds of building materials and mechanical equipment are complicated, so special personnel should be assigned to manage building materials and equipment. In the layout of the construction site, according to the sequence of construction procedures, the sequence of large-scale construction equipment entering the site should be determined to ensure timely construction, make the construction site orderly and reduce traffic congestion on the construction site. For the construction of building materials, our professional management personnel should count their quantity and types, check their quality, put them in storage after being correct, and conduct shading and moisture-proof treatment on some materials to prevent their own performance from deteriorating.

2.3 Strengthen the quality management of highway bridge construction materials.

The importance of building materials is self-evident. Only by well controlling the quality of construction materials can the quality of highway bridges be guaranteed. In the early stage of construction, we should shop around, test the quality of building materials and choose according to the economic principle. Before buying, you should have a certain understanding of the merchants and choose manufacturers with quality inspection certificates to cooperate. Such cooperation is a long-term interest cooperation, which can ensure that the interests of both parties will not be harmed.

2.4 Strict highway bridge completion quality acceptance

After the construction, it is one of the most important links in the project to strengthen the later quality inspection. Therefore, it is a very important task to improve the work efficiency of supervision engineers. The supervision engineer must be a professional inspector, with high requirements for his own quality. In quality inspection, we should first make clear the contents and standards of inspection, then proofread the inspection instruments, and finally conduct a strict and comprehensive inspection. Highway bridge engineering can only be put into use after the quality reaches the standard, which can greatly improve the quality of highway bridges.

3. Conclusion

Highway bridges play a very important role in our life. It not only solves the traffic problems in our life, but also brings us a prosperous economy. Therefore, we should ensure the quality level of highway and bridge construction projects. The quality level of highway bridges should be improved in many aspects, the most important of which is to improve the construction technology, not only from the quality control of materials, but also from the breakthrough of new technologies. It is necessary to introduce a large number of construction talents and constantly improve the current construction technology to enhance the ability to resist natural disasters. In terms of quality control, we should carry out meticulous management from all aspects, implement quality monitoring of each working procedure, and punish unqualified working procedures to warn each construction.

refer to

Gecai town Analysis on the deficiency of highway bridge construction technology and improvement measures. Shanxi Architecture, 20 13 (9): 16.

[2] Liu Chengde. Construction quality control of bored pile for highway bridge. Huazhang, 20 13 (7): 24.

Tall. Study on risk assessment and optimization of expressway bridge construction. Chang 'an University, 20 13 (8): 3 1.

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