The previous article has elaborated in detail on the specific application of prestressed technology in bridge construction, covering the selection and adaptation of prestressed steel strands and anchorage devices, the analysis and calculation of prestress effects, as well as the prestressed construction processes for reinforced concrete structures and concrete pavements. It fully demonstrates the implementation logic of this technology from core materials to actual construction. In the entire process of prestressed construction for road and bridge engineering, quality control is a core guarantee that runs through from start to finish—only by scientifically controlling material selection and standardizing the implementation of key construction links can the advantages of prestressed technology be fully converted into engineering effectiveness, and construction hidden dangers be prevented from affecting structural safety and durability. This article focuses on the quality control measures during the application of prestressed construction technology in road and bridge engineering, and discusses the core points and implementation paths of quality control from three key dimensions: construction material selection, concrete pouring operation, and cable threading construction operation.

1. Selection of Appropriate Construction Materials Based on Engineering Construction Requirements

In the prestressed construction of road and bridge engineering, the selection of construction materials is directly related to the overall quality and durability of the project. Therefore, it is crucial to select appropriate construction materials according to the engineering construction requirements. Firstly, a detailed survey and analysis of the engineering construction site should be conducted to understand the natural conditions such as geology and climate, as well as the service conditions such as traffic flow and load requirements, so as to determine the types, specifications and performance requirements of the required materials. Secondly, in the process of material procurement, suppliers with good reputation and reliable quality should be selected to ensure that the purchased materials meet the design requirements and relevant standards. Strict quality inspection should be carried out on the purchased materials, including appearance inspection and performance testing, to ensure that the material quality meets the standards. Finally, during the construction process, the management and use of materials should be strengthened to avoid moisture, damage or confusion of materials. Regular re-inspection of stored materials should be conducted to ensure stable material performance and meet construction needs.

2 Ensuring the Compactness and Rationality of Concrete Pouring Operation

Concrete pouring operation is one of the key links in the prestressed construction of road and bridge engineering, and its compactness and rationality directly affect the strength and durability of concrete. Before concrete pouring, the formwork should be carefully inspected to ensure accurate dimensions, firm installation and tight splicing, so as to avoid grout leakage and deformation. The steel bars should be positioned and protected to ensure accurate positions and uniform spacing, and prevent displacement or damage during pouring. During the pouring process, the pouring speed and vibration intensity of concrete should be controlled to ensure uniform and dense concrete. The pouring speed should not be too fast to avoid air bubbles and delamination; the vibration intensity should be moderate, which should not only expel air bubbles but also avoid concrete segregation caused by excessive vibration. After pouring, curing should be carried out in a timely manner to keep the concrete moist and avoid cracking and temperature cracks. Strength testing of concrete should be conducted to ensure that it meets the design requirements.

3 Ensuring the Standardization and Rationality of Cable Threading Construction Operation

Cable threading operation is one of the key steps in prestressed construction, and its standardization and rationality directly affect the tensioning effect of prestressed tendons and the bearing capacity of the structure. Before cable threading, the prestressed tendons should be carefully inspected to ensure that the surface is free of rust, oil stains and other impurities, and the parameters such as length and diameter meet the design requirements. The anchorage devices, clips and other accessories should be inspected to ensure reliable quality and tight fit. In the process of cable threading, the operation should be strictly carried out in accordance with the design drawings and construction plans to ensure that the direction, position of prestressed tendons and the layout of tensioning ends are accurate. The cable threading speed should be controlled to avoid excessive frictional resistance of prestressed tendons in the ducts. After the completion of cable threading, tensioning operation of prestressed tendons should be carried out. During the tensioning process, the tension force and elongation should be controlled to meet the design requirements. Regular maintenance and calibration of tensioning equipment should be conducted to ensure its accuracy and reliability.

Conclusion

To sum up, prestressed construction technology plays an important role in bridge construction. Through measures such as rational selection of prestressed materials, optimization of construction technology and strengthening of quality control, the effective implementation of prestressed construction technology can be ensured. In the future, with the continuous development of bridge engineering and the progress of technology, prestressed construction technology will be further improved and innovated, providing strong support for the construction of safer, more durable and more aesthetic bridge engineering.