Application Research On Water-discharging Pressure Relief Technology For Swimming-pool Anti-floating

As the typical "active" anti-floating technique, the "architectural water-pressure relief method" has been used in many basements of important projects. Practice shows that the anti-floating method has a very high reliability and economy. However, dead-weight anti-floating, anti-floating pile and anti-floating anchor as the "positive" anti-floating technique are still the main method in swimming pool projects. A lot of project accidents have proved that these traditional techniques can not meet the needs anymore. Therefore, it is necessary to introduce the "active" anti-floating concept to the swimming pool project.According to the characteristics of anti-floating in swimming pool and "architectural water-pressure relief method", this paper proposes the concept and construction method of "water-discharging pressure relief technology on anti-floating of swimming pool". The main construction method is to arrange the drainage pipes that throughout the structural layer at the right positon of bottom and sidewall of the swimming pool. Meanwhile, laying a certain thickness of high permeability material such as soil at the bottom of pool. When the anti-floating system need to work, open the valves of drainage pipe, the underground water through the pool by the drainage pipe. Meanwhile, using the original drainage system to drain off the water that accumulated in the pool. When the seepage of underground water has began, the water pressure near the bottom of pool decreases.First of all, this paper carries out a model test to improve the effectiveness of the anti-floating method in the swimming pool project. Burry the two uncovered cylinders which simulate the swimming pool structures in the same kind of soil, one of which was opened holes at the bottom. After the experiment started, rising slowly the water level in the foundation soil while observing the state of two models. The results of the experiment show that not only in the soil but in the clay, the structural model that applied the "water-discharging pressure relief technology on anti-floating" kept stillness all the time. However, the model that not applied the anti-floating technique floated when the water level rose to a certain height.Secondly, using the numerical simulation to study the applicability of the anti-floating method in several typical soil layer distributions. On this basis, this paper study the regularities of the factors that influence the effects of "water-discharging pressure relief technology on anti-floating". The results of numerical simulation show that it is necessary to take corresponding construction method in order to use the anti-floating method when the swimming pool was constructed on the high permeability soil layer. Besides, the numerical simulation also shows that the changes of several important factors such as thickness and permeability of fertilizer tank and cushion course, length and arrangement of drain-pipe have an important effect on the results of anti-floating method.Finally, this paper analyze the economy of "water-discharging pressure relief technology on anti-floating". It’s possible to obtain the structural geometry size and quantity of steel bar by designing a certain pool which was applied with dead-weight anti-floating method and "water-discharging pressure relief technology on anti-floating" separately. The size of pool is20m in length,10m in width,3m in depth. The quantity of concrete and steel bar decreased compared to the pool that was applied with dead-weight anti-floating method. This model test improved that the "water-discharging pressure relief technology on anti-floating" has economy advantages compared to the other anti-floating methods.