1. Preparation Work for Cast-in-place Box Girder Construction

Before constructing cast-in-place box girders, thorough preparation is necessary. Firstly, it is important to clean the bridge foundation to ensure the stability of all subgrades and to strictly control the quality inspection of relevant materials such as concrete and steel bar connections to prevent impacts on the quality of the subsequent construction process. Secondly, do a good job in construction safety technical disclosure work and provide technical and pre-job guidance for construction workers. Particularly, professional technicians should be arranged to conduct professional training and provided guidance on key tasks such as the erection method of the support frame, formwork assembly, prestressed steel wires, and steel grids. Thereby reducing construction errors and ensure that all workers master key construction techniques.

Box Girder Pre-assembly in Factory

2. Sequential Formwork Removal 

After pouring and shaping, it enters the formwork removal stage. During the bridge cast-in-place box girder formwork removal process, first remove the internal formwork and then the external formwork in sequence. After all the external formworks are removed, start to remove the formworks at the bottom and sides of the precast box girder. There are potential safety hazards in the process of removing formwork, such as formwork falling, so it is necessary to support the supporting parts when removing the formworks to maintain the uniformity of formwork stress and make improvements to the removal method, which can be removed synchronously from both sides to fully ensure the safety of the formwork removal work.

3. Apply Linear Control Method

To ensure the construction quality of the cast-in-place box girder of the highway bridge, it 's important to highlight the aesthetics of the highway bridge, thereby improving the comprehensive quality of the highway bridge. Currently, in constructing the pouring of the precast box girder of the highway bridge, the method for constructing the box girder web can be selected. Once this kind of formwork is properly operated, it can not only partially improve the construction quality but also enhance the aesthetics of the highway bridge.

Detailed Display of Box Girder

4. Protection of the Inner Formwork of the Top Plate 

The cast-in-place slab core mold of the cast-in-place box girder must be complete and sufficiently stable, otherwise it will affect the construction quality of the bridge. Before the concrete of the cast-in-place box girder is completely formed, the downloaded cast-in-place slab core mold must not be damaged or fall off. To prevent such issues, bolts are commonly used to fix the roof core mold, so that the roof core mold can be securely set in place and remain stable all the time. In the later operation process, the staff strictly follows the standard operation procedures, pay attention to the effective application of the construction method, and standardizes the operation process to guarantee project quality from the source and avoid the abnormal phenomenon of the roof core mold being damaged. On the premise of ensuring the stability and reliability of the roof core mold, it lays a solid foundation for the next step of construction and is conducive to the effect of concrete forming.

To Sum Up

At present, in the construction of municipal bridges, the scale is getting larger and the construction difficulty is increasing, it is bound to put forward higher requirements for construction quality, and more appropriate and scientific advanced construction methods should be adopted. In the process of cast-in-place box girder construction, construction workers must maintain the overall construction quality of bridge construction, strictly follow the construction standards, make the quality of highway bridges qualified, and ensure the safety of the bridges.