Chenab bridge ppt

design and construction

1. INSTITUTE OF TECHNOLOGY DEPARTMENT OF CIVIL ENGINEERING BANGALORE – 560097       CERTIFICATE Seminar On CHENAB BRIDGE BY KUMAR Under the Guidance of MS. ……. Asst. Professor,Dept. of CIVIL

2. Indian Railways has undertaken the mega-project of construction of a new railway line in the State of Jammu and Kashmir. The   Chenab Bridge  is a railway steel and concrete  arch bridge  under construction between Bakkal and Kauri in the  Reasi from Udhampur to Baramulla . INTRODUCTION

3. CHENAB BRIDGE

4. Deck height (height above river) - 359  m (1,178  ft.) Bridge length - 1,315  m (4,314  ft.) Arch span - 485m (1,532  ft.) Total number of span – 17 Maximum height of pier - 133.7m Description of bridge

5. Travelling in and around the mountainous region has been a great difficulty and dangerous for locals. For better transportation facilities Government of India Constructing a national railway project that will connect J&K with the rest of India. Need for the Chenab rail bridge

6. SITE OF BRIDGE Site is located in mountainous region of Jammu Kashmir .

7. Geology The Chenab Bridge is located in the trickiest section of the Jammu- Udhampur -Srinagar- Baramulla rail route, where the typical geology consists of young Himalaya rock . poor quality, broken rock with dolomitic limestone and firestone lentils with a silicate content . Rock class III to V with a strength of 60 to 100MPa and a volume weight of 2.7t/m³ is encountered The RMR (rock mass rating) index amounts to 40 to 60 .

8. The planning of this project has been done by WSP group (Finland) and design of arch is done by sub consultant Leonhardt . Indian Railway Standards (IRS Standards ), IRC, IS have been used while designing the bridge. The design speed of the railway was set to be 100 km/h and the design life had to be 120 years. Fatigue assessment shall be done as per BS: 5400 Part – 10 A ll conventional railway bridge loads, this bridge has to sustain special blast loads specified by Indian railway Design innovation

9. Wind loads will be derived using physical topographic models of the site and tests in a wind tunnel laboratory The bridge is designed to resist wind speeds of up to 260kmph . The seismic nature of the project zone was also considered during its design.

10. Limit state philosophy of design has been decided to be followed as per BS codes. Provision of long welded rail (LWR) over the bridges and resulting force calculation as per UIC – 774-3R guidelines. Deformation limits as per comfort criteria of UIC – 776-2R and UIC 776 -3R guidelines .

11. The bridge’s construction principle entails a large bridge arch with access viaducts at each side. The large arch is designed as a 2-fold ribbed arch comprising steel girders with scaffolding braces produced on the spot . 5 bridge pillars for the access viaducts are made of steel and 13 of concrete . The bridge will consist of about 25000 tonnes of steel structures, the main portion of which will be used for the arch bridge section Construction

12. A cable crane will be built over the valley for constructing the steel structures. The crane can deliver a maximum amount of 40 tonnes of steel parts.

13. FOUNDATION In order to set up the foundations for the bridge in the difficult terrain, Safe excavation at both sides of the valley is being prepared on a grand scale, drilling for foundation. The tallest pier is 137.7m tall, such a tall structure is required massive foundation of 150m*36.5m

14. Slope stabilization The side slope of the valley varies from 43 ̊ to 77 ̊ T he slope stabilization measure are design by the Indian institute of science. After excavation rock bolt of design length of 4m, 8.5m and 11.5m are installed.

15. Porus pipes are inserted to prevent the hydrostatic pressure

16. Guniting with steel reinforcement is provided to strengthen and stablize the slope.

17. Challenges in construction No proper road network in challenging terrain. The infrastructure of the area are causing additional problems. Transportation of the construction equipment. Sensitive region for terrorist attack.

18. The design of the main arch requires consideration of a number of additional parameters, such as fatigue, global stability, second order effects, composite action, etc . It also requires that such a bridge is designed to achieve a consistent level of reliability for all load cases, and that the design standards match the construction standards . The Chenab Bridge will be the biggest / the longest-span / the highest railway arch bridge ever built in the world. Conclusions

19. THANK YOU…