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Lali Cable-Stayed Bridge

Client Iran Water and Power Resources Development Company (IWPC)
Location Lali, Iran
Scope Of Work Engineering, Procurement and Construction (EPC)

Project Detail

Project Overview

Contract Type


Procurement & Construction


Lali-Masjed Soleiman, Iran

Executive status

Final Handover

Physical Progress


Commencement Date

Oct., 7, 2007

Initial Duration

24 Months


Brief Description

Lali Bridge is the longest Cable-Stayed bridge in Iran. Regarding the construction of Gotvand dam in Khouzestan, it was inevitable to construct this new bridge on Karoun River, between Lali and Masjed Soleiman cities.

The old bridge of this route which was constructed by the British Contractors in 1950, was located in the upstream of this Cable-Stayed Bridge. Regarding the construction of Gotvand Dam which led to increase the water level as much as 126 meters, so the old bridge and the strategic oil and gas pipeline of the region would be out of service, it was required to design and build Lali Bridge in this region with a height of 256 meters. Technical Specification This bridge total length is 460 meters with 3 spans (100 meters left-260 meters middle-100 meters right). The maximum

water level of the lake is about 230 meters and it should be 10 meters below the deck. Also the maximum level on top of bridge’s deck was considered to be more than 240 meters. The concrete supports have an A-shaped transverse section which consists of a pier and a pylon. The piers have a box cross-section with a constant dimension. The piers heights are 75 meters. At the top of the piers a horizontal cross beam between the two legs was arranged.


General Works’ Quantity

Earth Works 250,000 m³

Concreting 27,000 m³

Reinforcement 4,000 tons

Formworking 26,000 m²

Sliding formwork 32,000 m²

Metal works 1,500 tons

Post tensioned cable 200 tons

The pylons heights are 68 meters.

Piers and pylons wall thickness is

60 centimeters.

Two circular caissons with a diameters of 10 meters work as a deep foundation for each pier-pylon. The thickness of the caissons are 1 meter and their depth are 20 meters which were built based on the project geotechnical investigations results. The piers and pylons were constructed using sliding formwork system. The cables have a fan-like arrangement and are attached to the super structure by some transverse girders with a distance of 12 meters. The cables are arranged in 2 plans and the dead-end anchorages system was used for the cable-web connection.

The road width is 13.5 meters which is suitable for 3 lanes (2 lanes for vehicles and one refuge lane). There is a walkway on each side of the road. The width of each walkway is 1 meter. The cable connection point to deck is on

the outer side of the walkway. In addition to the above-mentioned width in each side of the deck there were 2 meters cantilever passage for the oil and gas pipeline. Finally, the total width of the bridge is 21.5 meters to fulfill all of the above requirements. The bridge’s deck has been pulled up and installed in its service location using heavy lifting system.