## 6 Conclusions  
A construction control method of temporary prestressing reinforcement is proposed in this study to control the level of tensile stress in the section of reinforced concrete arch cantilever construction. The equation for calculating the stress in the arch section under the joint action of prestressing and buckle forces was derived. The iterative optimization solution procedure was prepared. The effect of temporary prestressing on the regulation of arch section stress was studied, and the theoretical analysis was verified by field real bridge tests. The main conclusions were obtained as follows.  
1. The initial tension of the buckled cable with the introduction of temporary prestressing has increased to a certain extent compared with that without prestressing. However, the difference between the maximum force and the initial force during construction is significantly reduced, and the force distribution is more uniform. It avoids the large change of cable force during the construction process and alleviates the fatigue effect of the buckled cable during the construction period.
2. Temporary prestressing can effectively control the maximum tensile stress in the top and bottom flanges of the arch section within the control index, increase the compressive stress reserve in the arch section, improve the utilization rate of the arch ring material, and significantly reduce the risk of section cracking caused by the excess tensile stress in the arch section.
3. According to the comparison between the measured data and the theoretical analysis, the deviation between the measured stress and the theoretical calculation value is about 10%. Considering the discrete errors of data and concrete materials, the measured results are in good agreement with the theoretical analysis. The successful application of temporary prestressing in Shatuo Bridge provides novel ideas for the stress regulation of key sections during the construction of cantilever cast arch ring and can provide technical support for the breakthrough of cantilever cast arch bridges to larger spans.  
Conceptualization, Z.T., Z.Z., and W.P.; methodology, Z.Z. and W.P.; software, Z.Z.; validation, Z.Z. and W.P.; formal analysis, Z.Z.; investigation, Z.Z., W.P., Y.D., Y.C., and B.X.; resources, Z.T.; writing--original draft preparation, Z.Z. and W.P.; writing--review and editing, Z.T.; supervision, Z.T.; project administration, W.P.; funding acquisition, Z.T. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Nature Science Foundation of China, grant number 51478049; the National Nature Science Foundation of China, grant number 52078058; the Hunan Nature Science Foundation of China, grant number 14J]2075; the Hunan Natural Science Foundation of China, grant number 2022 JJ50323; the Major Technological Achievements Transformation Program of Hunan Strategic emerging industries of China, grant number 2017 GK4034; the Hunan Long-span Bridge Construction Technology and Assembly Engineering Technology Research Center of China, grant number 2018 TP2058; the Postgraduate Research and Innovation Project of Hunan, grant number CX20190660.  
**Institutional Review Board Statement**: Not applicable.  
**Informed Consent Statement**: Not applicable.  
**Data Availability Statement**: Not applicable.  
**Conflicts of Interest**: The authors declare no conflict of interest.