Prestressed Bridge Modules with Formwork Camber Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current prefabricated, prestressed bridge systems are cumbersome to manufacture and difficult to erect, leading to expensive and labor-intensive final products, lacking integrated structural members for consistent prestressing and efficient construction.
Innovation Solution
A prefabricated, prestressed bridge system comprising steel beams supported by formwork elements, with shear connectors and rebar, where concrete diaphragms are poured to create compression stress that secures prestressing forces, and camber is achieved by adjusting formwork elements or external loads, allowing for efficient and cost-effective production of modular bridge components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional prefabricated prestressed bridge systems are used, then bridge structure is achieved, but manufacturing complexity and labor intensity increase
Solution Approach 1:
The bridge system is divided into modular prefabricated units (girders, panels, trusses) that can be manufactured separately and assembled on-site. Each module is independently prestressed and can be produced in controlled manufacturing environments, reducing overall manufacturing complexity while maintaining structural integrity through standardized connection details.
Solution Approach 2:
Prestressing operations are performed in advance during manufacturing of individual modules rather than on-site during assembly. Concrete members are prestressed before being transported and installed, allowing complex prestressing operations to be conducted in controlled factory settings with proper equipment and expertise, thereby reducing on-site labor intensity and complexity.
2Productivity
If traditional erection methods are used, then bridge assembly is achieved, but construction time and labor costs increase
Solution Approach 1:
All prestressing, concrete curing, and structural strengthening operations are completed during off-site manufacturing before modules are transported to the bridge site. This preliminary completion of time-consuming operations enables rapid on-site assembly of fully functional bridge segments, significantly reducing construction time and improving productivity.
Solution Approach 2:
The bridge is segmented into discrete, self-contained modules that can be independently manufactured and simultaneously transported to the site. This segmentation allows parallel manufacturing of multiple modules and rapid sequential assembly on-site, thereby increasing construction speed and reducing overall project timeline.
3Reliability
If integrated structural members are added for prestressing, then prestress consistency improves, but device complexity increases
Solution Approach 1:
Structural members that provide prestress (such as prestressed concrete girders and bonded tendons) are integrated into the load-bearing components themselves rather than being separate auxiliary elements. The prestressing function is merged with the primary structural members, ensuring consistent prestress application while avoiding additional complexity from separate prestressing systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables faster, more affordable, and efficient construction of prestressed bridge modules that can be easily assembled into various sizes, reducing manufacturing complexity and labor costs while ensuring robust and prestressed bridge structures.
Implementation Method 1
adjusting one or more of the supporting formwork elements to stress the one or more steel beams
Implementation Method 2
resulting compression stress of the concrete deck secures in place the stresses imparted to the one or more steel beams
Data Source
AI summary
The prefabricated, prestressed bridge system comprises one or more prefabricated, prestressed bridge modules. Each module includes one or more steel beams arranged in a first direction on three or more supporting formwork elements that are arranged in a second direction generally perpendicular to the first direction. Rebar runs through the steel beams in a direction perpendicular to the steel beams and above at least two of the supporting formwork elements. Concrete material is poured to form concrete diaphragms on top of and around the rebar at locations above the supporting formwork elements. After the diaphragms are poured, one or more of the supporting formwork elements are adjusted to stress the steel beams. A concrete deck is fabricated over the surface atop the diaphragms and the steel beams such that the resulting compression stress of the concrete deck secures in place the stresses imparted to the steel beams.