Technologies

Novel Bridge Structure for Road Bridges


Abstract/Technology Overview

The presented bridge structure for road bridges includes a beam composed of two types of concrete parts laid alternatively with pre-stressing rods placed in a cable in their centre allowing for continuous changes of the pre-stressing force according to the external load intensity. This beam can be used in a wide range of applications with different crosswise arrangements for roads with pavements, with reflective strips, and for motorway bridges. A certain reinforcement of the beam frame section and a suitable composition of the number of the beams for crosswise arrangement is expected to allow for development of a beam for railway bridge application. The solution can improve the load distribution among the bridge beams, can reduce anchoring material and facilitate the construction of the bridge structure.


Technology Features, Specifications and Advantages

The drawbacks of current solutions are resolved by a bridge structure including a beam for road bridge construction consisting of at least one row of nine parts in the row, including five parts of full cross section and trapezoidal shape extending downwards and four parts of lightened cross section forming a bottom-open trapezoidal frame also extending downwards. This beam is symmetrical around its centre with the individual parts arranged symmetrically from the centre towards the sides.

The designed beam shows a compact frame-like shape with adjustable width. Another advantage is the option of operative adjustment of the pre-stressing force according to the external load intensity, or simple implementation of the structure as fully pre-stressed, partly pre-stressed or as pre-stressed reinforced concrete.


Potential Applications

This beam can be used in a wide range of applications with different crosswise arrangements for roads with pavements, with reflective strips, and for motorway bridges. A certain reinforcement of the beam frame section and a suitable composition of the number of the beams for crosswise arrangement is expected to allow for development of a beam for railway bridge application.


Customer Benefit

The disadvantages of the standard beams were in that after the beam assembly the end crosswise members had to be concreted for better load distribution among the beams. This was a wet process of connection of the old concrete with the new concrete, which is inconvenient and relatively labour-intensive in the formwork and the concrete laying stages. These beams were hard to connect with the substructure into an integrated bridge with a construction without bearings with low maintenance demand. The forces in the pre-stressing cables had to correspond to the wall thickness. In most cases the builders used more cables with lower pre-stressing force per cable, which required more anchoring material.

Our bridge structure for road bridges can improve the load distribution among the bridge beams, can reduce anchoring material and facilitate the construction of the bridge structure.

 

OVERVIEW
Technology Owner

Karolina Kasparova

Company

University of Pardubice

Technology Category
  • Transportation
  • Manufacturing
  • Materials
Technology Status
  • Available for Licensing
Technology Readiness Level
  • TRL 3