What is a lost form in box girder construction?

In box girder construction, a lost form is a temporary mold that is made using a material which allows the concrete elements to be easily dismantled and disposed of. They are generally made of polystyrene or plastic and are cast in such a way that they are easily removed after the concrete has set. This provides contractors with a faster, cheaper and more effective method of creating complex geometries.

Some of the main benefits of using lost forms in box girder construction include:

- Reduced construction time: Lost forms allow for the simultaneous casting of multiple sections, which can significantly reduce the total construction time.

- Improved quality: The use of lost forms ensures that the finished product is of a high quality, as they provide a smooth and consistent surface finish.

- Cost-effectiveness: Lost forms are cost-effective as they can be reused multiple times, eliminating the need for expensive, permanent formwork.

- Ease of use: Lost forms are relatively easy to install and remove, making them suitable for use on a variety of projects.

- Versatility: Lost forms can be used to create a variety of shapes and sizes, making them ideal for a wide range of applications.

Overall, lost forms are a versatile and cost-effective solution for box girder construction, offering a number of benefits over traditional formwork methods.