During the construction of high-speed railway bridge projects, continuous beams are often adopted as a key method to span rivers. To improve the final quality of bridge projects, scientific construction technologies must be applied, thereby further enhancing the overall quality of the completed project. However, from the actual situation of continuous beam construction, it poses considerable difficulties. Therefore, construction technicians must fully and accurately understand the construction technology and adopt scientific and reasonable construction measures to ensure the project meets the required standards and provides support for the construction of railway projects. This article introduces the five major factors influencing the cantilever construction control of high-speed railway continuous beams.

1. Structural Parameters

1.1 Cross-Sectional Dimensions: Differences in cross-sectional properties arise from different cross-sectional dimensions, which will affect the deformation and stress state of the structure. Due to the influence of multiple factors, the actual cross-sectional dimensions of beams often deviate from the design requirements. Therefore, precise cross-sectional dimension control measures should be taken to minimize design errors to the greatest extent.

1.2 Elastic Modulus of Materials: The deformation of bridge structures largely depends on the elastic modulus of the materials used. During the construction process, the elastic modulus of concrete must be reasonably adjusted to make it conform to the design value as much as possible.

1.3 Concrete Density: As the density of concrete changes, the weight of the structure will also change, which in turn affects the internal force and deformation of the structure. The bulk density of materials can be obtained through on-site tests, and the actual measured values should be used in the calculation model.

2. Calculation Model

An analytical model is established based on the structure of the bridge. By doing so, the continuous beam bridge can be controlled to ensure that the actual structure meets the design requirements. A scientific and accurate model is of great importance. During the modeling and analysis process, the principle of simplification must be followed to reduce the complexity of the structure, assign appropriate structural parameters, set boundary conditions, and check model errors as much as possible. This is to achieve precise control over the pouring and construction of the continuous beam bridge.

3. Formwork Elevation

A reasonable formwork elevation is a necessary prerequisite for ensuring the rationality of the beam cross-sectional height and also a key factor in the construction of the entire continuous beam bridge. If the formwork elevation is unreasonable, the problem of uneven alignment of beam segments will occur after the structure inclines.

4. Tensioning of Prestressed Steel 

Affected by the tension of prestressed steel, the structural properties of the continuous beam bridge will change, which is mainly reflected in the internal force and displacement of the structure. The construction environment is relatively complex, and many factors will affect the tensioning operation; phenomena such as deviations in the position of corrugated pipes may also occur.

5. Structural Changes Caused by Temperature Variations

With changes in temperature, the shape and tension of the bridge will also change. In some cases, the impact of temperature on concrete structures significantly exceeds that of loads, and temperature cannot be artificially controlled. Therefore, it is very important to accurately monitor the construction temperature. The basic characteristics of temperature changes should be summarized, and the timing of data collection should also be clearly defined—preferably in the morning or evening.

In summary, during the cantilever construction of high-speed railway continuous beams, the five major influencing factors (structural parameters, calculation model, formwork elevation, tensioning of prestressed steel strands, and temperature variations) are like key pillars supporting the project quality. Each factor is directly related to the stability, safety, and alignment accuracy of the bridge structure. Whether it is the precise control of cross-sectional dimensions, the reasonable matching of material performance parameters, the scientific establishment of calculation models, the strict calibration of formwork elevation, or the standardized operation of prestressed tensioning and dynamic monitoring of temperature variations, negligence in any link may trigger a chain reaction and have an adverse impact on the overall construction effect of the project. Therefore, construction technicians must incorporate these influencing factors into the key management and control scope, and continuously optimize the construction process through refined management and scientific methods to effectively ensure the quality and efficiency of the cantilever construction of continuous beams.

However, the analysis of construction influencing factors is only a basic link to ensure project quality. To achieve comprehensive and efficient control of the cantilever construction of continuous beams, a systematic and complete construction control system is required as support. Based on this, in the next article, we will focus on the core management and control links of the cantilever construction of high-speed railway continuous beams, and introduce in detail the seven major contents of the cantilever construction control of continuous beams. These contents will cover the application of monitoring technology during construction, construction error adjustment strategies, process connection management, safety risk prevention and control, and other key aspects, providing more targeted and practical construction guidance for the majority of engineering technicians and helping to further improve the construction level of high-speed railway bridge projects.