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3CENTRAL ASIAN RESEARCH JOURNAL FOR INTERDISCIPLINARY STUDIES (CARJIS) ilmiy jurnali bilan hamkorlikda. PRELIMINARY ANALYSIS OF THE SERVICE LIFE OF REINFORCED CONCRETE INTERMEDIATE STRUCTURES OF ROAD
BRIDGES.
Bobomurotov Saydulla Yunusovich
teacher, Termez Engineering and Technology Institute, Termez. bobomurotovsaydulla2022@gmail.com ANNOTATION
Analysis of existing bridges in Uzbekistan today, study of their types, construction and service life. It is about the introduction of the improved type of reinforced concrete bridges abroad in the territory of Uzbekistan.
Keywords: Reinforced concrete, concrete, high strength, water and gas permeability, cold resistance, chemical resistance, construction time, tensile strength, ductility, reinforcement, glue, static schemes, beams, frames, arches, mixtures.
Introduction. A moving part of an intermediate device is a set of structural elements that receive the effect of a moving load and transmit it to the supporting part of the intermediate device. The carriageway consists of a bridge deck and load-bearing elements.
The bridge deck is located on the load-bearing elements of the carriageway and serves to ensure the safety of vehicles and passengers, as well as to carry out drainage. The bridge cladding of reinforced concrete bridges consists of the following elements: bridge cladding layers, sidewalk cladding, boundary devices, drainage devices, deformation joints and bridge joining. Reinforced concrete bridges are placed on the bridge deck slab. This plate, as well as being a lifting element of the moving part, is a part of the main lifting constructions of the intermediate device and together with them forms a space system.
Bridge cover layers perform the following functions:
-protects the structures below it from mechanical impact;
-protects the structures below it from atmospheric moisture and acts as a waterproofing;
- provides ease of movement.
The bridge cover consists of the following layers: leveling layer, waterproofing, protective layer and coating (asphalt concrete or cement concrete).
The leveling layer under the waterproofing shall be made of concrete or cement-sand mixture, the thickness of which shall not be less than 30 mm. Waterproofing is placed on the leveling layer. High-quality waterproofing materials are used on large bridges, as well as in areas with high rainfall [1].
CENTRAL ASIAN RESEARCH JOURNAL FOR INTERDISCIPLINARY STUDIES (CARJIS) ilmiy jurnali bilan hamkorlikda.
Figure 1. Intermediate structures of reinforced concrete bridges.
Methodology: The main drawback is the relatively low virginity of the structure as a whole, especially if the intermediate devices are of large length. The advantages of cast-in-place reinforced concrete intermediate structures are mainly those of the above, with a high degree of integrity to the structure as a whole. Their shortcomings include: the need to build and organize various ancillary structures and equipment at the site of the bridge; due to the fact that the concrete takes a long time to fully harden, the construction and completion time of the main structure is much longer; In cold weather, concrete work must be stopped. All of this can lead to some inconvenience and increase the cost of construction. Specialists are required to be able to come up with the most appropriate solutions, taking into account all of the above and local conditions.
Analysis and Results: A full-scale method is a visual inspection of an engineering structure to identify defects, damages, and defects in the object being inspected, with recommendations for their subsequent elimination. A full-scale method of inspecting bridges is one of the main ones, as it allows you to see all the defects that have formed in the bridge structures during their service life. The structure of the bridge elements is described: driving surface coating, deformation seams, safety barriers, sidewalks, barriers, waterproofing, drainage, areas close to the bridge, gaps, supports, supports, cones and place under the bridge. An assessment of the condition of these elements is given. During the inspection of the bridge, the characteristics of the existing defects and damages, the assessment of transport capacity, high construction. The main disadvantages are the washing of concrete with open reinforcement, cracks and chips of concrete, the absence of a safety wall, partial breakage of the handles, structures to strengthen the collapsed cones.
CENTRAL ASIAN RESEARCH JOURNAL FOR INTERDISCIPLINARY STUDIES (CARJIS) ilmiy jurnali bilan hamkorlikda.
Figure 2. Structural details of reinforced concrete intermediate devices.
Conclusion. The bridge deck is located on the load-bearing elements of the carriageway and serves to ensure the safety of vehicles and passengers, as well as to carry out drainage. The bridge cladding of reinforced concrete bridges consists of the following elements: bridge cladding layers, sidewalk cladding, boundary devices, drainage devices, deformation joints and bridge joining. Reinforced concrete bridges are placed on the bridge deck slab. This plate, as well as being a lifting element of the moving part, is a part of the main lifting constructions of the intermediate device and together with them forms a space system.
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