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Wadi Abdoun Bridge, Amman, Jordan
This bridge across the Abdoun valley is a dual two lane concrete cable stayed structure which has a deck 45m above the deepest section of the valley floor. It is a continuous four span structure with two main spans of 140m on an 'S' curve alignment.
PRESTIGIOUS ABROAD PROJECTS
DAR CONSULTANTS
Bridge over the Sungai Selangor, Kuala Selangor, Malaysia
The asymmetric cable stay bridge has a main span of 232m and 114m back span along a 1000m radius. It is a pre-stressed concrete structure with a 25m wide deck comprising a glued segmental spine and precast side frame. The deck is supported from an inclined tower on a single plane of pre-stressed stays in the median which are anchored on the back span to a precast boom. An outrigger beam is employed to stabilize the tower with transverse stays anchored to the beam below deck level.
Wadi Leban Bridge, Riyadh, Kingdom of Saudi Arabia
A cable stayed bridge with 405m central span and 179m side spans. The deck is 35m wide and made of precast spine and cantilevers. The deck being 75m above the ground has a shaped pier head formed to provide a stable support for the pier segments to be erected and also a platform upon which to work and for transferring the crane to the higher level to construct the towers.
Sungai Prai Bridge, Penang, Malaysia
The project is 1.4km long, with the main river crossing of 485m. The navigation span is 185m long cable-stayed with side spans of 50m. The 28m wide dual three lane deck consists of precast concrete segments made up of central spine segments with side cantilevers. The spine is constructed first and side cantilevers erected as a second stage using the constructed spine.
Shaikh Isa bin Salman Bridge, State of Bahrain
The marine bridge is an example of total design taking account of all disciplines. It is a pre-stressed concrete structure with a 32m wide deck supported on a single plane of pre-stressed stays. The stays were pre-stressed to increase their durability and eliminate problems associated with fatigue in the stay cables. The stays use normal pre-stress anchorages achieving significant economy. Exceptional quality of concrete finish achieved by pre-casting.
Elevated Federal Expressway, Kuala Lumpur, Malaysia
The proposal is to create an elevated urban viaduct 14km in length with 3km of associated on and off ramps. The selected alignment utilizes a dual carriageway viaduct and generally follows the route of existing Federal Highway R2. The advantages being that expropriation and land acquisition are minimized allied with less impact and disruption to existing interchanges, utilities and services. The height of the deck varies from 7m to 25m and consequently the aesthetic quality of the deck when viewed from below assumes considerable importance. The construction of the deck is carried out from the top level by using the finished portion of the viaduct for access. The adoption of precast segmental construction over in-situ work affords the necessity economy and high quality in terms of material properties, consistency, durability and surface finish.
Riyadh Ring Road, Riyadh, Kingdom of Saudi Arabia
The ring road consists of 150km of principal arterial streets and urban expressways with 40 diamond interchanges and 11 free-flow interchanges. The challenge facing the Consultancy was to provide the Ministry of Communications with plans for a network required to form the basic framework of the city master development plan and to cope with the interim arrangements and construction traffic resulting from the plan's phased implementation and ultimately to serve and stimulate the development of the city.
Corinth Canal Bridge, Greece
The project conditions required that the highway design be strictly adhered to with a 600m radius curve at a skew of 51 degree grads to the axis of the canal. The bridge is a concrete cable stayed structure of 160m main span and 50m side spans supported from two towers one on each side of the canal. The deck is carried by a parallel plane of cables along the median. The towers are inclined towards the outside of the curve to make the stay cables tangential at the point of connection to the deck and are stabilized by the transverse stays which are anchored to the outrigger beam at each tower support.
Al Khaleej Viaduct, Riyadh, Kingdom of Saudi Arabia
The three level Al Khaleej interchange is part of the 2km long, twin three lane Khurays Road Viaduct, which has received international acclaim as an outstanding urban viaduct. The viaduct has 15 spans in total which are generally 102m in length except at the Al Khaleej interchange which consists of an over sailing arch spanning 130m with the simultaneous opening up of the Airport Road underpass below in the form of a landscaped terraced arena. The deck varies throughout the whole length of the viaduct using a well-defined varying soffit geometry displaying purity of line and a free form sculptural effect that sweeps down to support plinths, thereby, eliminating the need for conventional piers.
Jeddah-Makkah Expressway Viaduct, Jeddah, Kingdom of Saudi Arabia
The Jeddah-Makkah Expressway is designed to provide a high-speed high-capacity link between Saudi Arabia's major seaport and the Holy City of Makkah. The Expressway is elevated on dual three lane viaducts for the first 10.5km within the Jeddah urban area, descending to ground level for the remaining 60km across mainly desert terrain to the Holy City of Makkah. A standard single deck width of 17.45m was adopted for the viaduct with spans ranging from 36m to 40m. Span by span construction using precast segments facilitated the speed of erection and provided the quality control to ensure a high standard of finish throughout the entire length of the viaduct, one of the largest in the world.
Indoor Sports Stadium, Cairo, Egypt
The Cairo Indoor Sports Stadium was built within eighteen months to a fast track design and construction schedule to accommodate the Pan-African games. The complex consists of four sports hall each having a domed tensioned-cable roof structure clad with aluminium. The principal arena roof structure has an overall diameter of 120m and consists of multi layers of varying diameters of pre-stressed cables tensioned across a concrete beam. Each layer of cables is offset from the centre of rotational symmetry. Trusses of varying heights and decreasing diameters were used to create the cascading dome effect.
Qurashiyah Viaduct, Riyadh, Kingdom of Saudi Arabia
The viaduct was constructed in 24 months by the balanced cantilever method with a fully precast segmental superstructure 484m in length, consisting of five main spans of 77.5m and two end spans each 48m long. The bridge deck has a double cell box spine girder with side frames giving an overall width of 26.5m and supported on slender twin-leaf piers 30m in height. The pier leaves have a constant separation of 2m and built integral with the deck. The graceful form of the shaped piers, curved in plan and also elevation, allow them to flex for temperature movements and yet be stable to carry vertical load requirements. The high quality finishes obtained illustrate the degree of detail that can be achieved when the refinement level of the finished structure is perceived and considered at the concept design stage.
Diwan Underpass, Jeddah, Kingdom of Saudi Arabia
The 650m long dual 4-lane underpass separates through traffic between the port and northern suburbs of Jeddah from traffic entering the Royal Palace and so provide it with a fitting entrance approach. In order to minimize disruption to traffic at this important location, design and construction were completed within 10 months. A very high standard of concrete finish was required to all the underpass elements including the walls and the post-tensioned, in-situ bridge works which spans the underpass. The precast concrete parapet and lining wall units are meticulously detailed and combined with lighting elements produce an overall effect of considerable beauty.
Covered Drinking Water Reservoir, Muna, Kingdom of Saudi Arabia
The 1 million cubic meter circular reservoir is 365m in diameter and has one of the largest cable-stayed concrete shell roofs in the world and provides a secondary source of water for the millions of pilgrims performing the annual Hajj to Makkah. The concept is based on the inherent stiffness of a ring of 'A' frames from which radial in-situ beams, cast using rotating formwork, are stayed with over 214m clear span. The roof is composed of precast concrete barrel vault shells, acting integrally with the beams to form a strong and efficient structure. The enclosed volume beneath the roof is 1.7 million cubic meter with a surface area almost 90,000 sq.m and a perimeter of over a kilometer is greater than the London Millennium Dome.
Long Span Cable Structure Concept
Competition runner-up in 'The Bridge Image' sponsored by the New Civil Engineer 1988. The landscaped dual carriageway spans the main axis of the elliptical envelope which carries a high speed rail link at the lower level and capable of spanning 1km-2km.