Leakproofness of the reinforced concrete tank for water with a capacity of 45000 m3

Abstract

The clean water tank discussed consists of four reinforced concrete tanks. The structure is symmetrical for each of the tank pairs, which consist of two storage tanks and two water transfer tanks for the water supply network. All chambers are technologically connected with each other. The tanks are partially recessed in the ground, monolithic, and completely roofed. The projection of chambers within external walls is 96 x 96 m = 9,216 m2. The total capacity of internal chambers and external chambers is about 45,000 m3. The clean water tank was made as a reinforced concrete structure, monolithic. The owner of the facility observed significant losses of stored water, which translated into large financial losses of the company. In order to determine the current technical condition of the reservoir and the causes of its leakage, a comprehensive, multi-level analysis was carried out in terms of strength, stability and durability of the structure. A few dozens of samples were taken at random, and the compressive strength of the concrete, modulus of longitudinal deformation and degree of carbonatization were evaluated. For the assessment of the technical condition of the expansion joints, boreholes were also drilled through them. On the basis of the results obtained from the tests, numerical analysis of the stress on the structure and its deformations was performed in order to select the most stressed areas as well as to assess expansion deformations as potential spots of the largest leaks. The results of the analysis were used to prepare the concept of sealing repairs of the tank chambers.