In the given article the design of service life for hydraulic structure reinforced concrete elements has been performed analytically with the use of the basic techniques and by constructing reinforced structure protective layer carbonization models, mathematic modelling methods for physical processes. The main goal of the work is to determine the service life for reinforced concrete structures of spillways and its elements under impact of the environment during their operation.

This article includes the analytical assessment of the durability and remaining life of the I-st category reinforced concrete structures by the fracture mechanics approaches, the prediction is based on the consideration of temporal changes in the structural features of a particular type of concrete. The main purpose of this work is to determine the durability of reinforced concrete structures and the remaining life of the spillway and components in the implemented modes and operating conditions that ensure their safe operation and environmental protection. When predicting the durability of the spillway reinforced concrete structures, each structure is considered as a component of the structure behavior scheme. The result of the durability predictions is presented in years, which can eventually determine the remaining life of the structural component of spillway.

The given method uses the safety coefficient by service life period and similar principles as for stochastic method. Moreover, the problem of forecasting the safety is examined in a deterministic form. The given option for the solution is compact in terms of design on an applied level in the format of the boundary conditions method, keeping the efficient control of safety within the service life period. This method has the advantage to design reinforced concrete structures for specified service life period. The proposed method is also applicable for the design of reinforced concrete elements of hydraulic structures in cases when the application of the other stochastic methods would be very complicated. The advantage of the given method is allowing including the stochastic nature of loading parameters and material strength.

The article discusses the restoration of irrigation pump station discharge pipelines’ design parameters, based on sand-cement anticorrosion shotcrete coating technology. Repair of created cracks, damages during operation, and restoration of design parameters of discharge pipelines is performed using shotcreting with Kalmatron® (USA) additive. Besides, paper theoretically validates optimal design data of restored discharge pipelines, the thickness of the anticorrosion coating, and their influence on working characteristics of irrigation pump stations. Theoretical and applied tasks are resolved based on the practical implementation of foreign technology, local supplies, and the use of the Company’s standards at water facilities throughout Uzbekistan’s irrigation systems developed and implemented by the authors of this article.

The article contains information on the KK-2,1 bucket-mower, which is developed in the first in Uzbekistan, which is a one-bucket hydraulic excavator hanging on the handle, consisting of a finger cutting device, a bucket-basket and a chain drive from a hydraulic motor. The bucket-mower of an alogical designation has not been developed to this day either in our country or in the CIS countries of the near abroad. Therefore, the vegetation that grows on the bottom and slopes of the collector-drainage networks was not scraped and annually gave up to 20 cm of siltation in the form of a dried mass, sometimes this mass was destroyed either by burning in early spring (late autumn) or removed by single-bucket excavators from the place of sediment from the bottom collectors in the form of soil glybement with the roots of coarsely fledged vegetation.