Construction of a Cross-Passage for a Twin Tunnel system for Delhi Metro's CC-27 Project
R.G. Saini, Project Director, DMRC,L&T-SUCG JV CC-27, New Delhi, India.
Ishaan Uniyal, Student, Dept. of Civil Engineering, Thapar University, Punjab, India.
In this paper, construction of cross-passage for a twin tunnel system has been discussed along with problem encountered and solution adopted, by using a case history of cross passage in R.K Puram Station, being constructed by L&T-SUCG JV for CC27 of Delhi Metro. Work for the cross-passage commenced after the completion of the twin tunnel on account of ease and efficiency. Method employed for construction of the cross-passage and specifications of materials used have been reported in this paper. The paper also reports a solution adopted for mitigation of a major problem of water-logging encountered during the construction. Approach adopted to address the problem has also been reported in the paper. Efficacy of the procedure utilized and applicable conditions for same along with possible contributing factors have been indicated in the paper.
Ishaan Uniyal, Student, Dept. of Civil Engineering, Thapar University, Punjab, India.
In this paper, construction of cross-passage for a twin tunnel system has been discussed along with problem encountered and solution adopted, by using a case history of cross passage in R.K Puram Station, being constructed by L&T-SUCG JV for CC27 of Delhi Metro. Work for the cross-passage commenced after the completion of the twin tunnel on account of ease and efficiency. Method employed for construction of the cross-passage and specifications of materials used have been reported in this paper. The paper also reports a solution adopted for mitigation of a major problem of water-logging encountered during the construction. Approach adopted to address the problem has also been reported in the paper. Efficacy of the procedure utilized and applicable conditions for same along with possible contributing factors have been indicated in the paper.
Introduction
Cross-passages are reinforced concrete structures built in between either two tunnels (as in case of twin tunnel systems) or a tunnel and the ground surface. They are provided to serve two primary purposes namely, emergency escape and maintenance work. In this paper, design, construction methodology and problem encountered during construction of one such structure has been described by analyzing case of a Cross-passage being constructed by L&T-SUCG JV for twin tunnels between R.K Puram and Munirka underground stations for project CC27 of 'Delhi MRTS Project of Phase-III'.This is a premium article available exclusively for our subscribers.
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NBM&CW June 2016
