A Real-Scale Model Test on Constructanility of Railway Bridges
with Composite Girders Converted from Temporary Girders
By K. Watanabe, T. Nagata, T. Ichinomiya and K. Takada
Concrete Journal, Vol.41, No.8, Aug. 2003
- Synopsis
- A new construction method, in which tenmporary girders of railway bridges in use are reinforced with additional steal beams and convered with concrete in order to make the composite girders be the permanent structures, will be firstly employed in the construction of the crossing of JR-line and Ring road No.2 in Tokyo. However, the problem of the difficult concrete compaction due to the complex and narrow spaces composed by the H-beams, precast concrete forms and their connection metals had not been cleared. The possibility of the loss of unification between the H-beams and the cover concrete due to the deflection induced by the train traffic during the curing period since few hours after the concrete placing had been worried, too. Therefore, a real-scale model test was conducted to verify the constructability of the composite girders. The test results verified that the use of self compacting concrete ensures completeness of placing and filling of the cover concrete during the short interval of the train business hours and that sufficient integrity of the concrete-steal composite girders can be achieved even under the continuous train loads applied during the curing period.
- Keywords:
- temporary girder, precast concrete form, self compacting concrete, composite structure, deflection by train load, interval of train business hours
