In the field of modern bridge construction, with the increasing demand for transportation and the advancement of complex projects such as crossing rivers and seas, construction technologies are constantly being innovated. The cantilever beam technology, by virtue of its unique advantages, plays a crucial and significant role in bridge construction. It can not only effectively solve the construction problems under complex topographical conditions but also ensure the stability and safety of the bridge structure. From the fabrication and installation of the form traveler to the construction of the closure section, every link of the cantilever beam technology embodies scientific design and exquisite techniques.

1. Fabrication and Hoisting of the Form Traveler

The components of the balance cantilever form traveler must to carry out the production in accordance with the established requirements to ensure that they can meet the actual construction needs. Specifically, during the fabrication of the form traveler, the manufacturing work should be completed according to the design drawings, and the manufacturing process should be clearly defined to ensure that the form traveler has good stability and safety. Before the formal construction, the on-site investigation should be completed. The construction personnel should inspect the mechanical equipment to be used and understand its actual operation status. At the same time, it is necessary to ensure that the professional personnel have good comprehensive qualities, so as to ensure that no safety accidents will occur during the installation process. When hoisting the form traveler, the protective measures should be implemented properly to ensure that the parts will not fall off. The form traveler can only be put into use when it can maintain stability. When designing and installing the support platform of the form traveler, in addition to ensuring that the plane size can meet the operation requirements, its strength should also be enhanced. After the components of the form traveler arrive at the construction site, dedicated personnel should be assigned to check the components, focusing on their dimensions, processing accuracy, etc. If they do not meet the specified requirements, they should be replaced immediately. In addition, during the installation of the form traveler, symmetrical assembly should be carried out. The main beam and the crossbeam should form an integral structure, and the measurement of the edge symmetrical points must be accurate to ensure that warping and deformation can be effectively avoided. After the assembly work is completed, the relevant personnel should carefully check the assembly quality. The form traveler should form a good integrity, and its safety should meet the requirements before it can be put into the construction work.

2. Preloading and Load Test

Before the formal preloading construction, the force-bearing tie rods should be effectively treated to ensure that the force on the front crossbeam is relatively uniform. During the construction process, the two form travelers on both sides should be consistent. The determined grade standard is 10t, and the maximum loading capacity is 100t. During the loading process, the changes of the form traveler should be observed. Once obvious changes occur, they can be detected in a timely manner. Here, it is necessary to focus on whether components such as the main truss have non-elastic deformation. The load test is also indispensable to determine the bearing capacity of the form traveler. When actually applying the cantilever form traveler technology, the column beam should be divided into multiple sections for symmetrical pouring. When designing the form traveler, the largest beam section should be taken as a reference to ensure that the bearing capacity of the form traveler exceeds the weight of the largest beam section, so that the application effect of the cantilever form traveler technology can be more ideal and the economic efficiency can reach the established goal.

3. Reinforced Concrete Pouring Construction of the Closure Section

During the construction of the cantilever form traveler, it should be carried out in the established order, that is, the side span construction should be completed first, followed by the secondary span, and finally the middle span. When closing the continuous beam, converting the cantilever beam system, and adjusting the support reaction force, the following points must be effectively implemented. During the concrete pouring process, the elevation of the beam end should be observed, the changes in temperature should be paid attention to, and it should be ensured that the spacing of the cantilever section is the most reasonable. The length of the closure section should be effectively controlled. Before the formal construction, the temporary connection work should be completed according to the design requirements. The temporary anchoring on one side should be appropriately relaxed or changed into a movable support. The preloading of the cantilever beam section should be effectively carried out, and the elevations of the cantilever section and the pouring section should be consistent. During the closure process, the established order should not be changed without authorization. First, the side span is closed, and then the middle span is closed. During the closure construction, the weight pressing and unloading should be the most reasonable, so that the closure accuracy can be effectively improved and the concrete will not crack. The weight pressing and unloading should be equal to the concrete pouring of the side span and the middle span. When closing the side span, the loading of the weight pressing should be the most appropriate to effectively prevent the upward deflection of the middle span section. When closing the middle span, the weight pressing unloading work should be completed. During the closure construction, special attention should be paid to the problem of concrete cracking. Generally, micro-expansive concrete should be selected, and its strength grade should be slightly higher, and it should be ensured that the new and old concrete can be effectively combined. It should be noted that the time of the closure section construction should be controlled. Around midnight is more suitable, as the temperature is lower at this time and there will be no obvious changes, so that the influence of temperature changes can be reduced, and the probability of concrete cracking can be effectively decreased.

In conclusion, the application of the cantilever beam technology in bridge construction is a systematic and rigorous process, and every link is closely connected and indispensable. From the precise fabrication and hoisting of the form traveler, to the strict control of the bearing capacity through the preloading and load test, and then to the scientific arrangement of the pouring construction of the closure section, these technical key points jointly guarantee the smooth progress of the bridge construction and the project quality. With the continuous progress of construction technology, the cantilever beam technology will also continue to be optimized and upgraded, playing a greater role in more complex bridge construction projects in the future and providing a solid technical support for the vigorous development of the transportation industry.