In recent years, State Grid Corporation of China has actively promoted the life cycle management of construction projects, combined with the research results of engineering design, and formulated the direction and requirements of the life cycle design of transmission line engineering according to the concept of life cycle, aiming at actively promoting the application of life cycle management in power enterprises. Vigorously promoting life cycle management will surely lead the new direction of power grid construction and development and drive the innovation of enterprise asset management concept. 1 Overview of Life Cycle Management Theory 1. 1 The connotation of life cycle management refers to the comprehensive consideration of the planning, design, construction, operation, maintenance, renewal and final scrapping of a project from the perspective of long-term economic benefits, so as to maximize its benefits in the whole process. The method based on life cycle management will make the project cost more reasonable and the income higher in the whole life cycle, thus achieving the goal of sustainable development and improving the project benefit. 1.2 Lifecycle Management (1) is characterized by systematicness. The whole life cycle management of a project is not an isolated project, but a systematic project, which is a whole linked by many control factors. Only systematic and scientific management can ensure the realization of the ultimate goal. (2) Multi-stage. Project life cycle management is divided into different stages in the process of project life cycle. Life-cycle management requires good continuity of work at all stages, so that the specific work at all stages is interlocking and the management process is integrated. (3) Multiple subjectivity. The life cycle management cost of a project involves many subjects, including investors, builders, suppliers, customers and consumers, and they are interrelated and restricted. (4) complexity. The life cycle management of a project is not only the management of the project decision-making and construction stage, but also the maintenance management of the project operation stage. These factors will make the life cycle management of the project more complicated than the traditional management in the past, so it is necessary to predict the life cycle cost of the whole project from the project establishment and design stage. 1.3 The core theory of life cycle management, life cycle cost (LCC), refers to the sum of all costs and expenses that occur in the life cycle of a project, that is, the total cost of the project. The life cycle cost of transmission line engineering is the total cost of each stage and each element in the life cycle of transmission line engineering. In this paper, the cost is analyzed and studied through certain technical methods, and corresponding measures are taken to realize the optimization of the life cycle cost of transmission line engineering. Transmission line construction projects can be divided into construction stage and operation and maintenance stage according to stages, and their corresponding costs are construction cost and future cost. The construction stage includes project planning, design and construction, and the corresponding expenses are called construction costs; The operation and maintenance stage includes the use and recovery or scrapping stage, and the future costs including operation and maintenance costs, recovery or scrapping costs are called future costs. 1.4 Significance of life cycle management The application of life cycle management mode in transmission line engineering construction is in full compliance with the concept of saving society put forward by the state and the management concept of State Grid Corporation of China, which is of great significance, mainly in the following aspects: it is conducive to formulating practical goals; It is beneficial to improve the safety and reliability of the project; Conducive to project saving and environmental protection; Life cycle management of transmission line engineering is a key measure to improve asset quality and prolong the service life of equipment. Conducive to the maximization of the overall interests of power enterprises. 2. 1 Insufficient decision-making basis in the cost management of transmission line engineering At present, in the construction of transmission line engineering, the decision-making basis often pays too much attention to the index of infrastructure investment, but not enough attention to the future operation and maintenance investment, which will easily lead to the situation that the initial capital investment of the line is small and the subsequent operation and maintenance investment is huge, thus greatly increasing the cost of the whole life cycle of the line engineering. Therefore, the deficiencies in the current decision-making basis need to be improved through the concept of life cycle. 2.2 There are defects in the project supervision system. At present, in the construction of transmission line engineering, the supervision work only stays at the level of quality inspection, and the management of specific matters in the process of project implementation is far from enough. This is also the deficiency of the current project supervision system, which needs to be continuously improved in the future. 2.3 There are defects in the quota design system. At present, in the construction of transmission line engineering, the starting point of quota design is good, but it is often overlooked that different projects have different on-site actual conditions. Blind emphasis on quota is easy to limit the design ideas of designers, greatly reducing the rationality of design and causing many negative effects. Therefore, the rationality of quota design system needs further discussion. 2.4 There are deficiencies in the research on cost estimation in production and operation stages. At present, in the construction of transmission line projects, the research on future operation and maintenance costs is not deep enough, and often stays on the surface, which brings many problems to the decision-making basis of the project. In the feasibility study of the project, the discussion on this aspect is even more casual, and there is no very accurate calculation of operation and maintenance cost, which leads to loopholes in life cycle management and challenges the life cycle cost estimation of the whole transmission line project. Therefore, it is still necessary to strengthen the research on cost estimation in production and operation stage and further play its role in the life cycle management of transmission line engineering. Application of life cycle cost in transmission line engineering design. Transmission line engineering design should be based on the theory of life cycle management, combined with the actual situation of the project, and optimize the life cycle cost design. Mainly in the aspects of path selection and recommended scheme, meteorological and environmental conditions, grounding conductor selection, tower planning and tower form selection, foundation form selection and optimization, insulation coordination, operation and maintenance, etc. 3.65438+ In order to avoid the inevitable section, various technical measures should be taken to ensure the safe operation of the line. According to the theory of life cycle cost, the relationship between appropriate construction cost, operation and maintenance cost and future income is considered from the whole life process. For the construction of the line itself, it is necessary to improve the construction standards. Even if the detour cost is slightly higher than the sum of crossing and processing costs, the detour scheme should be chosen. Only in the specific investment scheme, according to the reconnaissance results in the feasibility study stage, the owner, the operator and the designer comprehensively consider the reconstruction costs and benefits that may occur in the future, and combine the subsequent site reconnaissance and agreement, and put forward 2-3 comparison schemes for places where there may be a lot of house demolition, factory demolition and difficulties in signing agreements. 3.2 Geological research is based on the life cycle management concept. At the initial stage of design, the site along the line should be surveyed, and the adverse geological effects such as topography, geological structure, stratum lithology, special soil distribution, landslide and debris flow along the line should be preliminarily identified, and the geotechnical engineering evaluation should be carried out in sections; Find out the situation of ore crushing and goaf along the line, and the groundwater burial at the maximum freezing depth of foundation soil along the line, and preliminarily evaluate its corrosiveness, so as to provide a basis for selecting the path scheme; In addition, it also provides the main physical and mechanical properties and parameters for the actual design. Avoid the secondary design and construction caused by the inconsistency between the design and the actual geological conditions, effectively save resources and reduce the investment of manpower, material resources and funds. 3.3 The site reconnaissance of hydrological research should measure and analyze the vertical width, oblique span width, height difference from the river bottom, sandy composition of the river bed, height between the two banks, and the maximum submerged depth of the river, and adjust the design scheme to prevent the line from being damaged by natural disasters such as floods, thus greatly saving the operation cost and maintenance cost in the later stage of the project and embodying the management concept of the whole life cycle. 3.4 Meteorological research is based on the guiding ideology of the whole life cycle. At the initial stage of design, we conducted on-site meteorological reconnaissance, collected data, and studied the design wind speed and conductor icing by mathematical statistics, which provided an effective basis for actual design, integrated theory with practice, reduced the difficulty of operation and maintenance, and enhanced the safety and reliability of the line. 3.5 Life cycle management should be considered in the selection of conductors and ground wires. The selection of conductor should not only ensure safe operation, but also have reasonable technical and economic indicators. Usually, with the increase of transmission capacity, the resistance loss of conductor increases, so it is better to choose a larger cross-sectional area of conductor, but the initial investment and annual loss cost should be considered comprehensively. Using the method of minimum annual cost, the conductor models are compared economically. 3.6 Tower Planning and Tower Selection According to the plane section drawing, combined with the surveying and mapping of field investigation, the intersection position and height of main roads, power lines, communication lines and other major intersections are increased to provide relatively accurate section data for tower sequencing optimization. Combined with the life cycle theory, unconstrained optimization sequencing is carried out, and the goal of optimization sequencing is to minimize the project cost under technical conditions. Then, under the same objective conditions, the horizontal load, vertical load, tower height, line corner and tower head clearance are planned by using the mathematical method of golden section. Planning can complete the planning of one tower, two towers, three towers, four towers, five towers and six towers as required. The more tower schemes, the lower the comprehensive cost. However, when there are many tower shape schemes, the difference between tower weight and comprehensive cost becomes smaller and smaller, so the number of schemes for planning tower shape can be determined. Then, according to the use of swing angle coefficient, horizontal span, vertical span, height difference coefficient and rotation angle of each tower in the selected scheme, the swing angle and its clearance of the tower are determined. At the same time, the concept of life cycle management is implemented in the process of tower design optimization, and the scheme optimization of the whole process of design, processing, construction, operation and maintenance is comprehensively considered.
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