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Quality of the project management and control

Block work; ④ to the concrete in the foreseeable intermittent long-asked spread crack the surface of pre-reinforcement. 4.4.3 The strength and homogeneity of concrete to meet the design requirements of the bid of 1999, the major varieties of local population sample of concrete strength test results is: I standard: concrete grade R150D100s8, the average strength of 28.63 ~ 30.70MPa, are variance of 3.39 ~ 4.46MPa, deviation coefficient 0.1l8 ~ 0.15; concrete grade R2 (X) D150S10, the average strength of 36.30-40.30MPa, standard deviation 5.06 ~ 5.93MPa, deviation coefficient of 0.14 to 0.15. 1 / objectives: first, second quarter, R2 (X) D150S10 and the average strength of 28.3 ~ 29.3MPa, standard deviation 3.79-3.39MPa, deviation coefficient 0 .131 ~ 0.116. Third and fourth quarters to R150D100S8 and the average intensity of 26.5-26.8MPa, standard deviation 2.64 ~ 2.78MPa,[link widoczny dla zalogowanych], deviation coefficient 0.098 ~ 0.105. Ⅲ tenders: concrete grade R250D250S10, the average strength of 32.6-34.2MPa, standard deviation 3.23 ~ 3.693MPa, deviation coefficient of 0.094-0.112. According to standardized criteria, these indicators are high level. Of course, this indicator is the local population sampling results, and the actual placement of the dam concrete targets should be different, to be drill core for further examination, test 5 Conclusion According to l999 Three Gorges dam and the construction of the concrete situation the following preliminary conclusions can be drawn: (1) tower with concrete solutions to the main machine to meet the high-strength concrete, high-quality construction requirements. Completed in 1999, 364.79 million in concrete, pouring concrete tower with a total of 1,477,400 machines | Tl3, accounting I, Ⅱ bid of 47.27% the amount of concrete pouring, a single tower with a machine pouring capacity has reached 5 months million / month, that towers with a machine with a capacity of high-strength concrete pouring; by taking appropriate measures to properly solve the tower belt machine pouring concrete coarse aggregate with four separate pre-cooling of concrete feed conveyor line in the temperature pick-up so we are generally concerned that ensure the construction progress,[link widoczny dla zalogowanych], but also ensure the construction quality of concrete. (2) the quality of concrete construction in 1999 to meet the design requirements. This is mainly reflected in: the hot season in the pouring of concrete so the amount of basic constraints, the maximum temperature of concrete dam to meet the design requirements; too dam and the plant does not appear through the cracks of the basis, less the number of surface cracks, the concrete poured strength and better homogeneity. (3) Concrete Construction also exposed some weaknesses, needs further improvement. Although proud of the quality control of concrete is too hard, too has made considerable achievements, but there are still some weak links in the future work to be further improved: ① the higher the moisture content of sand, and less stable, lead to concrete slump is too difficult to control; ② part of the concrete surface of dislocation, Gualian such phenomenon is a further specification template erect; ③ concrete structure construction details need to be strengthened. Part of the deck of the cooling water pipes, just laid pulp sheet and the surrounding thick concrete construction technology, resulting in cooling water pipe blocked string when joint grouting zone, on the one hand to increase the processing workload, on the other hand also shows that concrete existence of local defects, should further improve their work style, improve construction standards. (Continued from page 33) line of 90,343 units of engineering quality, all qualified, which 714O4 a good unit, good rate of 79.1%; 1999 quality assessment unit for the 17708 project, all qualified, excellent unit 14240, good rate of 80.4%. Overall. Quality of the project to meet the design requirements. 4 Conclusion of the Three Gorges Project's quality assurance system has been established and perfected, organization and rules and regulations is basically sound,[link widoczny dla zalogowanych], quality control measures are effectively implemented, good quality project has been built to meet the design requirements, construction has made progress in weight too. Currently,[link widoczny dla zalogowanych], the Three Gorges Project has entered a very critical period, in 2000 5.4 million pouring concrete plans, the metal structure and mechanical and electrical embedded parts total up to 3-8 million t, and the different types of operation process will ask the interference of the ACP, constraints factors increase, quality control task more difficult. To this end,[link widoczny dla zalogowanych], the parties participating in the construction to be \to the \