Mandal, S.K. and Ghosh, A.k. and Oraon, S. (2018) Controlled Blasting for Deconstruction of a Railway Bridge Near Sahibganj. Journal of The Institution of Engineers (India): Series A, 99 (2). pp. 359-367. ISSN 2250-2149

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Abstract

Some of the Indian Railway bridges require reconstruction for electrification and expansion of railway tracks. Dismantling of bridge within time schedule in densely populated area requires controlled and pre-planned blasting methodology for safe pulling down of the structure and quick removal of blasted debris for fast restoration of tracks and smooth plying of trains. The three arched railway bridge (Bridge No. 61) located between Sahibganj and Karamtola cases one such example where the bridge was dismantled and the track was restored within 4 h of blasting, though the stipulated block period for demolition and restoration of tracks was 6 h. The 25.48 m long three-arched bridge was drilled and blasted with 225 number of blastholes (32 mm diameter) and 100 kg explosive (25 mm diameter). Length of blastholes varied between 0.5 and 1.8 m with blast geometry of 0.3–0.35 m burden and 0.33 m spacing. This paper deals with the conceptual and theoretical model developed for identification of the key locations for drilling and implementation of the same. It also discusses about the precautionary measures and the drilling pattern adopted for quick demolition and speedy restoration of tracks.

Item Type:	Article
Uncontrolled Keywords:	Demolition Controlled blasting Brick and mortar constructed bridge
Subjects:	Geo-Mechanics and Mine Design
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	20 Nov 2018 09:58
Last Modified:	20 Nov 2018 09:58
URI:	http://cimfr.csircentral.net/id/eprint/1941

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