Form traveler cantilever pouring is a key technology commonly used in the construction of continuous beams. When pouring concrete, it is essential to ensure that the operation platforms on both sides of the piers remain stable and balanced, thereby guaranteeing the smooth progress of construction work. In the previous article, we discussed the influencing factors of continuous beam cantilever construction control, and this article will help you understand the specific control contents of continuous beam cantilever construction.
The most fundamental aspect is the simulation analysis of the construction stage. Through this method, the internal force and displacement of the main beam corresponding to each construction phase can be obtained, which serve as a guide for subsequent construction. After the construction of a specific section of the main beam is completed, the elevation and stress values must be measured. The actual results are compared with the theoretical values to summarize the causes of errors, and adjustments are made in the subsequent construction process.

1. Alignment Control

1.1 Monitoring Process

The control of bridge alignment adjustment is mainly integrated into elevation control, where deviations are reasonably adjusted based on the actual maximum elevation of the beam.

1.2 Data Collection and Analysis

Based on linear observation data, the adjustment status of the bridge can be evaluated, and the gap between the actual status and design requirements can be compared. Factors affecting bridge alignment are mainly reflected in three aspects: the elevation of the erected formwork, the elevation after concrete pouring, and the elevation after tensioning. In this regard, engineers and technicians must conduct accurate measurements in these three aspects and make timely adjustments.

2. Formwork Elevation Measurement

In cantilever pouring construction, the elevation of each segment must meet design requirements. The prerequisite for achieving this goal lies in the rationality of the formwork erection elevation—and the most critical part of alignment control is the measurement of the formwork erection elevation. If there is a deviation in the formwork erection elevation during construction, the beam section may appear cracked, which is harmful to the quality of the bridge.

3. Main Beam Elevation Measurement

To accurately measure the displacement of each box girder, measuring points are set in the project and distributed on each cantilever beam frame.

4. Stress Control

Stress control is also a key content in construction control. Without effective stress control measures, the risk of concrete cracking will increase. In engineering practice, the self-weight of the bridge is mainly considered as a structural load factor, and the difference between the actual value and the design value should not exceed ±5%.

5. Stability Control

Construction control of bridges must also focus on stability control. Currently, there is no sufficiently reliable monitoring method in the industry. In most cases, stability calculation is used as the basis for comprehensively considering the internal force and deformation of the bridge structure, followed by a comprehensive analysis. In addition to the bridge structure itself, various auxiliary structures used in construction—such as brackets and form travelers—are also key to stability control. These structures must also meet design requirements.

6. Safety Inspection

In the entire bridge control system, safety control is the most critical, and it is also a necessary prerequisite for ensuring the continuous progress of bridge construction. Other types of control work can only be carried out on this basis. During construction, safety control must be taken as the core. The rationality of control indicators such as alignment and stress fully reflects the effectiveness of bridge safety control, and there is a close interrelationship between them.

Conclusion

In summary, alignment control, formwork elevation measurement, main beam elevation measurement, stress control, stability control, and safety inspection in the cantilever construction of continuous beams are interlocking and indispensable. The accurate implementation of each content is the core to ensuring the quality, safety, and construction efficiency of bridge projects. Among these, the formwork— 作为 the basic carrier of construction—its accuracy, stability, and adaptability directly affect the accuracy of formwork erection elevation and the integrity of the beam section. Moreover, it is a prerequisite for the smooth progress of subsequent work such as alignment control and stress control.
As a professional bridge formwork manufacturer, Boyoun has been deeply engaged in the industry for many years and has a profound understanding of the strict requirements of continuous beam cantilever construction for formwork. The bridge formwork we produce not only strictly complies with engineering design standards—ensuring precise cross-sectional dimensions and standard flatness through refined processing—but also provides customized solutions according to the structural characteristics of different continuous beams. Whether it is the special formwork required for form traveler cantilever pouring or the box girder formwork adapted to different main beam cross-sections, our products can meet the requirements for stability, safety, and efficiency in construction, helping construction teams achieve various control goals more easily.
If you are promoting a continuous beam cantilever construction project and aspire to improve construction quality and reduce the difficulty of management and control through high-quality formwork, please feel free to contact us at any time. We can provide full-process services from formwork design and production to on-site technical guidance to safeguard your bridge project. We look forward to cooperating with you to empower project construction with high-quality formwork and jointly build safe, durable, and high-quality bridge projects!