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Continuously strong bridge structure with variable concrete density gradient

A rigid-frame bridge and concrete technology, applied in the direction of bridges, bridge parts, bridge materials, etc., can solve the problems of low tensile strength, difficult construction, and high maintenance costs, reduce the weight of the structure, reduce adverse effects, and improve resistance. The effect of crack strength

Active Publication Date: 2009-10-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-strength lightweight aggregate concrete has large shrinkage and creep, low tensile strength, and oblique cracks still appear in the main beam between the mid-span of the bridge and the pier-beam consolidation; High maintenance cost; not only the maintenance cost is high, but also the mid-span deflection of the reinforced bridge and the cracking of the box girder cannot be effectively controlled, and the reinforcement technology cannot solve this problem

Method used

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  • Continuously strong bridge structure with variable concrete density gradient
  • Continuously strong bridge structure with variable concrete density gradient
  • Continuously strong bridge structure with variable concrete density gradient

Examples

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Embodiment 1

[0020] At present, there is no continuous rigid frame bridge with concrete density gradient change at home and abroad. Only a few foreign countries have introduced high-strength lightweight aggregate concrete into the mid-span of continuous rigid-frame bridges, and built continuous rigid-frame bridges whose superstructure is composed of high-strength lightweight aggregate concrete and high-strength ordinary concrete, achieving a lightweight structure. Self-weight to optimize the mechanical properties of the structure. For example, the Stolma continuous rigid frame bridge with a main span of 301m built in Norway in 1998 used high-strength ordinary concrete at 58.5m of the pier-beam consolidation on both sides, and high-strength lightweight aggregate concrete at the middle span of 184m. However, after this type of bridge is completed and put into operation, a large number of oblique cracks still appear in the main beam web between the mid-span and the pier-beam consolidation, wh...

Embodiment 2

[0047] In this example, a continuous rigid frame bridge structure with concrete density gradient changes is proposed. In the mid-span and side-span mid-span, dry high-strength lightweight aggregate concrete with low apparent density is introduced, and high-strength aggregate concrete is applied through the mid-span and side spans. Light aggregate concrete further reduces the weight of the structure; the pier-beam consolidation of the middle span is made of high-strength ordinary concrete to meet the high compressive and cracking strength requirements of the pier-beam consolidation; the mid-span of the mid-span and the pier-beam consolidation Fiber-toughened and anti-crack high-strength sub-lightweight concrete is introduced into the main beams in between, which not only reduces the self-weight of the structure, reduces the impact of shrinkage and creep, but also enhances the crack resistance of the structure. The above three concrete materials are applied to the middle span of ...

Embodiment 3

[0052] In this example, a continuous rigid frame bridge structure with concrete density gradient changes is proposed. According to the stress condition of the continuous rigid frame bridge, high-strength lightweight aggregate concrete with low apparent density is introduced into the mid-span and side span. Further reduce the self-weight of the structure; the pier-beam consolidation of the mid-span and side spans are all made of high-strength ordinary concrete, which meets the high compressive and cracking strength requirements of the pier-beam consolidation; The main beams between the places are all introduced with fiber-toughened and crack-resistant high-strength sub-lightweight concrete, which not only reduces the structural weight, reduces the impact of shrinkage and creep, but also enhances the structural crack resistance. The above three concrete materials are all applied to the mid-span and mid-span of the continuous rigid frame bridge. By optimizing the combination and m...

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Abstract

The invention relates to a continuous rigid frame bridge structure with concrete density gradient changes. The upper structure of the bridge adopts three kinds of concrete materials, wherein: the base material in the mid-span adopts high-strength lightweight aggregate concrete with a dry apparent density not greater than 1950kg / m3 , in order to reduce the weight of the structure; the base material of the pier-beam consolidation is high-strength ordinary concrete with a dry apparent density of not less than 2300kg / m3 to meet the high compressive and cracking strength of the pier-beam consolidation; the mid-span and pier The base material of the main beam between the beam consolidation places adopts fiber-toughened and crack-resistant high-strength lightweight concrete with a dry apparent density of 1950kg / m3-2300kg / m3 to reduce the structural weight, improve the crack resistance of the concrete, and reduce shrinkage and creep. Negative Effects. The present invention can solve the technical problems of continuous rigid-frame span mid-span deflection and serious cracking of box girders through the optimized combination and matching of materials and structures and the optimized arrangement of prestressed beams.

Description

technical field [0001] The invention relates to the field of bridges, in particular to a continuous rigid frame bridge structure with concrete density gradient changes. Background technique [0002] Long-span continuous rigid-frame bridges have a large number of constructions and have broad application prospects. However, more than 80% of the continuous rigid-frame bridges built in my country have various degrees of mid-span deflection and box girder cracking, which seriously affect the safety of bridge operation. Therefore, mid-span deflection and box girder cracking control technology have always been hot issues in the research of continuous rigid frame bridge construction. [0003] Since the 1980s, scholars at home and abroad have investigated and studied a large number of continuous rigid frame bridge diseases, and believed that the main causes of continuous rigid frame bridge span deflection and box girder cracking are: (1) The weight of ordinary concrete. Self-weight ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/00C04B28/00C04B14/06C04B24/24C04B14/48C04B16/06E01D101/24
Inventor 刘沐宇丁庆军高宗余张强赵志斌卢志芳卢傲熊红霞张利华袁卫国孙向东田耀刚
Owner WUHAN UNIV OF TECH
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