What is precast segmental box girder

The bridge viaduct is divided into small segments, that are prefabricated in the good quality control casting yard, then, delivered to install by good erection equipment.

Advantages and Benefits

1. Construction Simplicity
• easier installation of external post-tensioned tendons

2. Time Savings/Cost Effectiveness
• precast segment to be prefabricated and stored at casting yard while foundation and sub-structure are being built.
• by using efficient erection method and equipment, the rapid installation of viaduct can be achieved.

3. Quality Control Q - A/QC
• precast segment to be produced in factory-manner condition w/ good quality control.
• minimum interruption natural impacts such as bad weather, rain.
• minimum waste of material
• good precision in production
4. Inspection and Maintenance
• external prestressing tendons can be easily inspected and repaired if required.
• maintenance program can be scheduled.

Key componets

1. Casting Yard and Segment Production
(Geometry Control Program and Software)
2. Segment Erection/ Installation and Equipments

Segment casting yard components

1. Short-Line Match Casting and Casting Mould Units
2. Production and Working Space
• Rebar Assembly
• Prestressing Work
• Segment Touch-up/ Repair
• Ready-mixed Concrete Plant
3. Lifting Equipments
4. Storage Area

The Teheran expressway project has begun its construction in the early a few decades ago.
The project total length is 140km, but stopped only for 30km.

Boyoun supplied
Segmental assembly box girder formwork

Tianjin–Baoding intercity railway project.

Tianjin–Baoding intercity railway, also known as Tianjin-Baoding Passenger Line,the railway length is 158 km and with a maximum design speed of 250 km. Most of the new trackage will be on an elevated viaduct, accounting for 65.4% of the line of the being on bridges.

Boyoun supplied
Segmental assembly box girder formwork

The formwork products, systems and design service include bridge formwork, tunnel formwork, and scaffolding.

Boyoun's business is based on a combination of production, equipment sale & rental, installation and maintenance.

Engineering

In Boyoun we invest heavily in R&D in order to add value to the industry. The Boyoun engineering department has created more than 40 patents and utility models.

This has enabled the implementation and industrialization process of "cast in place" concrete structures, in addition to providing added value in security and ergonomics.

Technology

We offer on site consultation and safety advice to help our customers work safely and improve productivity in each project.

The Boyoun Technical Office combines its staff experience with advanced CAD systems and self-developed software to do this job.

Boyoun Comprehensive Service

Boyoun strives to be one of the most recognized companies in its industry due to its comprehensive service capacity.
This output should be yield as a result of the quality of the company's human team, the range of solutions and services that Boyoun offers to its clients and its business management focused on total quality.