Discussion on optimization of construction layout of hydropower project?
I. Purpose and significance of the study
China is rich in water resources. At present, the construction of water conservancy and hydropower projects is booming. The development and utilization of water resources is of great strategic significance to China's economic take-off and social development. Under the requirements of the current development of China's socialist market economy, it is more valuable to analyze the investment decision of engineering construction projects, optimize the allocation of resources, and make full use of economic development to give full play to the benefits of each water conservancy investment. Therefore, we must choose the best scheme to reduce the construction cost and shorten the construction period. The layout of water conservancy and hydropower construction is an important part of the construction organization design, which is compiled according to the topography, geology, hydrology and hydrogeological conditions of the construction site, the layout of the project hub and the requirements for the layout of temporary facilities during construction. Study and solve the layout of sand and gravel concrete system, auxiliary enterprise factory, warehouse system, living room, wind, water and electricity supply system during construction, so as to make the layout scheme safe, reliable, economical and reasonable, and suitable for production organization and management.
Second, the analysis of influencing factors of construction layout scheme of water conservancy and hydropower projects
The overall construction layout involves many factors and can be evaluated from different angles. There are two main types of evaluation factors, one is qualitative and the other is quantitative. The main qualitative factors are: (1) the degree of favorable production, easy management and convenient life; (2) Reclaimed land area; Recovery rate or construction cost, etc. ; (3) the impact on the construction and operation of the main project; (four) meet the requirements of safety, fire prevention, flood control and environmental protection; (5) The combination of temporary works and permanent works. The indicators belonging to quantitative factors mainly include: (1) earthwork volume and cost of site leveling; (2) the degree of excavation and utilization of earthwork; (4) the transportation workload and expenses of various materials; (5) Land acquisition area and cost; (6) in the process of construction, the degree of coordination; (7) Construction and installation quantities and expenses of overlay projects.
Site selection of construction facilities
The site selection of construction facilities is the basic content of the layout of construction enterprises, and it is analyzed and selected according to the key and core construction facilities of the hub project. For water conservancy and hydropower projects with concrete as the main body, sand-gravel concrete system is the key to the location and layout of construction facilities, which includes all facilities and the whole production process from sand-gravel aggregate mining, processing and transportation to concrete batching, mixed finished products and production. In the construction process, the sand-gravel concrete system accounts for about 25% of the whole project labor force and bears about 90% of the whole project transportation. Its main characteristics are large scale, unbalanced production, many work links, long production line and strict requirements on product quality. Therefore, the site selection of sand-gravel concrete system plays a very important role in the whole concrete construction process.
3. 1 site selection principle of concrete production system
Aggregate yard, aggregate processing plant and concrete plant complete the preparation of finished concrete products through one-way transportation of materials and their respective processing, which are collectively referred to as concrete production system. Sand and gravel material source planning is an important part of the preparatory work in the early stage of engineering construction, and it is the basis of sand and gravel material processing system design, which has an important impact on the cost control of engineering concrete. The site selection of sand and gravel aggregate processing plant should be considered in combination with the overall planning of sand and gravel concrete system and the comprehensive comparison of storage yard and transportation scheme. Concrete plant is generally composed of mixing station (station) and its auxiliary facilities such as storage, transportation, processing, heating and cooling of various concrete materials. Large and medium-sized water conservancy and hydropower projects with concrete dams as the main body have large and concentrated concrete and strict quality and variety requirements. The factory production of concrete is of decisive significance to ensure the smooth progress of the project.
3.2 concrete production system site selection content
The feasible location of facilities construction must be determined according to the engineering exploration data, the principle of facility location and the knowledge and experience of engineering decision makers. In the process of facility site selection, it is necessary to analyze the site selection scope and content of sand-gravel concrete production system, and conduct feasibility study of sand-gravel concrete on the basis of content selection of sand-gravel concrete system and facility site selection. The method to determine the feasible location set of facility construction is: assuming the possible location set I = {1, 2,3 ... n}, through comprehensive evaluation of all possible location sets, determine the feasible location set of facility site construction, and determine It can only show that these locations can meet the requirements of engineering construction layout, and the decision of construction location must also comprehensively analyze the planning of gravel yard and the transportation conditions of gravel concrete. Determine the construction site through economic and technical comparison. For concrete dam construction, the site selection of gravel yard, screening processing system and concrete mixing system is an important link in the layout of construction facilities. The cost of dam and concrete largely depends on the cost of sand mining, processing and concrete transportation. Therefore, when planning the material yard and determining the construction position of the sand-gravel concrete system, under the condition of ensuring the quantity, quality, supply level and concrete pouring intensity of the engineering sand-gravel, all the costs involved in the site selection process should be comprehensively analyzed to make the decision-making scheme economical and reasonable.
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