Comparison Of A High-rise Building Underground Construction Schemes And Economy

High-rise building basement and related the palisade structure, long construction period, high cost of the project, the construction is difficult due to hard to ensure the quality, etc. Thus the construction period, cost, quality as the basement construction of the three control objectives are difficult to balance. Paper a basement of commercial residential building in Guangzhou as the research object, the study found that:The conventional construction method if used for the project construction, less upfront capital investment, construction of these technologies are mature; Lower requirements for project management and construction personnel; Foundation pit supporting can be according to the actual circumstance of the surrounding can use temporary support form, but may cause deformation of foundation pit; Earthwork excavation by external environment influence is bigger, long construction period and uncontrolled. Estimate to the period of 716 days opens to booking a condition, the basement structure construction cost is 88.61 million Yuan.The reversed construction method if used for the project construction, the preliminary needs a lot of money, the construction technology is complex, emphasis and difficulty in locating, installation and concrete pouring of concrete filled steel tubular column and the earthwork excavation; For project management and construction personnel demand is high, after completion of the first layer of floor, take two construction interface operation at the same time, need to guarantee the desired targets at the same time, construction organization and coordination is difficult. Estimate to the period of 336 days opens to booking a condition, the basement structure construction cost is114.39 million Yuan.By comparative analysis approach, Local framework approach and success degree method for engineering analysis of two construction schemes, can be concluded that this project adopts the reversed construction method after corresponding measures construction quality can be guaranteed; After fulfilling the first floor to the upper structure and lower basement two interface for construction work at the same time, will make the project to open to booking a condition of time 380 days ahead of schedule; Take special method to increase the use of related resources, at the early stage of the project cost need to increase 25.78 million Yuan. Although direct construction cost increase, but in combination with the project as the background of the real estate development projects, through the analysis of the capital management of real estate project, it is concluded that key nodes in completes the construction project cost control, can be about $20 million of indirect benefits, shows a better overall economic, environmental and social benefits.By demonstrating practical engineering, the construction period, cost and quality need to seek a balance between three big control goal, at the early stage of the project construction feasibility study, project construction scheme according to the actual situation of project make project milestone nodes: 1. The first floor casting is complete;2. The upper structure construction to the 14 th floor, to open to booking a condition, at the same time, the basement to complete the negative layer structure;3. The upper structure caps, at the same time, the complete floor basement structure. According to the node corresponding completion time, the construction time limit for a project plan. As the development project of the real estate enterprises as the leading, drained as soon as possible is the key to the development of real estate project, but at the same time, the cost is also another key factor to influence decisions. The reversed construction method is used for the project construction is a double-edged sword, it need to increase costs, and can greatly shorten the time limit, to alleviate the pressure of the real estate enterprise debt as soon as possible, but if no milestone at or beyond the time, shorten the construction period of advantage will reduce or disappear, and may even cause real estate enterprise capital chain rupture, project failure.The three major goals in the key consideration is the construction period, the second is the cost and quality, to achieve anticipated goal, must from the project began in the early establishment reasonable bidding document, select the appropriate construction team, equipped with relevant qualification and experience design team and technical management personnel, the construction process will coordinate all parties work fully, do this, just can make the similar projects on the basis of the guarantee quality, by reasonable increasing construction cost greatly shorten the construction period, realize the balance of the three objectives unification.