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.
Highlights
The facility in question consists of four tanks
Referring to the standard provisions, it can be said that in the end the entire test procedure must answer the question whether the ultimate limit state (ULS) of the object has been exceeded, and whether the requirements of the serviceability limit state (SLS) are met
The following SGU combination was adopted to check the unsealing of the expansion joints in the transverse wall: 1,0 ⋅ friction + 0,8 ⋅ water + 0,8 ⋅ ground ⋅ 2 (In further calculations, if the tank was filled with water, the value of ground pressure impact was multiplied by 2)
Summary
The facility in question consists of four tanks. In terms of construction, each tank is a separate, unconnected unit, independent of the neighbouring tank. The clean water tank was made as a reinforced concrete structure, monolithic. It is used for storing water in order to smooth out changing needs over time. Layer II, 8-10 mm thick, is made after partial hardening of the rendering coat, of the 1:2 mortar, with the use of steel smoothing trowels, with gradual compaction of the mortar until an even surface is obtained. After partial hardening, this layer had to be scratched. Layer III was surface-sealed by firing after 24 hours
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