Rehabilitation method of simple mean by Up-Down method of temporary support

 

 This design method used that to effective cope with reducing stress on the final state and with deflection and crack of existing beam. Just introduces the secondary compressing force by equiping with temporary support to center section of span of existing beam that have removed deck plate concrete and risen temporary support and unify with the existing beam by pouring deck plate concrete and make compressing stress add to understructure of existing beam by removing the temporary support.

 

Execution scheme

Execution step

Simple beam structure and moment diagram when slab concrete is removed

Structural system and moment diagram when the temporary support is risen

Moment diagram by fixed-supported state in center section and slab load

Structural system and moment diagram when temporary support is removed

Structural system and moment diagram when live load is applied

 

Rehabilitation method of the exiting continuous beam bridge

 

Execution contents

Rehabilitation method by removing the part of deck plate

State that is removed the part of deck plate

Pour concrete in the section of negative moment

Up-support

Pour concrete in the section of negative moment

Down-support

Pouring asphalt

 

Execution contents

Rehabilitation method by removing all of the deck plate

State that is removed the part of deck plate

Pour concrete in the section of negative moment

Up-support

Pour concrete in the section of negative moment

Down-support

Pouring asphalt

Rehabilitation crack method of the existing bridge by loading

 

 This rehabilitation method improve uncertainty of resin injection which is the problem that rehabilitation methods by existing resin injection into the existing bridges have by applying load. And, after the injected resin harden, the restoring force by unloading introduces the compressing force into the injected resin, so this method which is the method of crack rehabilitation to improve quality of existing bridge can be applied to P.S.C., Preflex bridges and all of other bridges.

 

Execution contents

Rehabilitation crack method of one span

Loading and injection-refilling

Equip injection pipe

 

Rehabilitation crack method  of two span continuous beam bridge

 

 

 

A panorama photograph of injected epoxy resins and hardening