RDSO PSC Girder

Sir I want to know that has the RDSO done the study the cracks in structure, its durability for PSC girders of Mumbai-Surat section of Western Railway bridge NO 73 Dn line.

[Shaleen]

Hey the Bridge No. 73 over Vasai creek on Mumbai-Surat section of Western Railway is
one of the important bridge commissioned in 1991.

Yes friend the RDSO has done the study the cause of cracks in structure, its durability and to suggest possible repair and rehabilitation strategies for PSC girders


RDSO Inspection

During inspection, some crackswere reported in the PSC girders. As such, CBE/Western Railway vide letter No.W65/20/80/4 vol.III (W3) dated 25.6.04 ( Annexure-I ) approached RDSO to study thecause of cracks in structure, its durability and to suggest possible repair andrehabilitation strategies for girders of bridge NO 73 Dn line. Accordingly, work was takenup.

The aim of the test was the Condition assessment of Bridge No. 73 DN by conducting various Non-destructive Tests along with design review and to suggest possible remedial measures

Bridge situation

The bridge with 1x20 m + 28 x 48.5 m span is located at Km. 43/15 – 45/6 between
Bhyandar and Naigaon stations of Western Railway. General view of the bridge is
shown in photograph – 1.

It is a PSC Box girder bridge constructed in 1991. The track is laid with LWR, 60 Kg rail
on PSC sleepers with M+7 sleeper density.

There were many fine cracks observed inside the inner faces of the web in most of the box girders.

Some fine cracks are also seen on outer face of the girders.


Process of Of Investigations

To investigate the cause of cracks, girders were visually inspected and tested with the
help of Non Destructive Techniques.

Since most of the girders are having problems of cracking, among them span No.1 of 48.5m from Mumbai end, on which, RDSO had conducted field trials during Dec.,2001 and Jan.,2003, has been selected for conducting various Non-destructive tests.

Thereafter, design review of end anchorage portion was also done critically.


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