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Mega Bridge, Industrial Ring Road, Bangkok, Thailand
Weekly cycle of four 173 m high pylons
simultaneously with PERI ACS
Around 64 million people live in the Kingdom of Thailand - the land of the smiling faces. In the capital, Bangkok, there are officially 7.5 million although insiders speak of over 10 million inhabitants and rising. In addition, due to its favourable geographical situation the city is one of the leading economic powerhouses in South-East Asia as well as an important centre for trade with the west. In order to deal with the constant rise in the volume of traffic, various plans for the avoidance and alleviation of traffic congestion have already been implemented.
The most spectacular project is the so-called Mega Bridge which is part of 13 km long Industrial Ring Road (IRR) located in Bangkok ´s main industrial area. Here, the Chao Phraya river forms a large meandering loop which means the bridge crosses the river twice in a north-south direction. On the strip of land in the middle, there is a freeway junction constructed at a height of over 50 m allowing a free flow of traffic to the west - no freeway crossing to slow down the speed of vehicles. Directly under this motorway interchange, with all its connecting roads and access areas, the land area will be landscaped and redeveloped as leisure facilities. The Mega Bridge construction project comprises of two striking cable-stayed bridges with lengths of 702 m and 582 m. Both bridges, with spans of 326 m and 398 m respectively, are supported in each case by two pylons – designed to form a diamond shape - with heights of 173 m and 164 m. Responsible for the construction of the bridges is the Japanese TNNS consortium (Taisei, Nishimatsu, NKK and Sino Thai). Completion is planned for 2006.
* Automatic Climbing System
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| PERI Systems In Use |
ACS R Self Climbing System
VARIO GT 24 Girder Wall Formwork
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Akira Mihashi, Project Manager, and Hirobumi Kono, Site Manager from the Japanese Taisei Corporation
“The PERI formwork solution contributed a substantial part for the successful realisation of this project. The formwork adapted superbly to the changing cross-sections and different inclinations. A high work-rate was achieved through the safe and good working conditions provided by the PERI ACS.”
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Demanding pylon geometry
PERI was awarded the contract to supply the self-climbing formwork for all four pylons which had to be constructed simultaneously. The well thought-out formwork concept developed by PERI engineers, backed up by the successful completion of the Kao Ping Hsi bridge in Taiwan, tipped the scales in favour of a renewed partnership.
Due to the given pylon geometry, the demands placed on the formwork planning and selected systems were extremely high. Complicated three-dimensional intersections through forward and reverse inclinations had to be taken into consideration. Furthermore, the around half a metre per concreting section tapering cross-sections, along with chamfered edges on the inside and outside, were also to be included in the planning requirements. |
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Casting segments in weekly
cycles – fast and accurate
In close cooperation with the client, PERI developed an efficient formwork solution using the crane-independent self-climbing technology, PERI ACS (Automatic Climbing System), along with the PERI VARIO GT 24 variable girder wall formwork system. Planning was easily and safely implemented afterwards on the construction site. The formwork and climbing system could be used for all standard concreting sections without having to undergo any modifications on the ground. The inevitable adjustment work to the VARIO caused by the changing cross-sections was able to be carried out throughout from the integrated platforms. Even during the difficult transition from the lower to the upper areas of the pylons (Lower and Upper Leg), the platforms continued to be used without requiring any substantial alterations. |
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Only with the changeover to the vertical sections (stem) – concreted up to heights of 158 m – were fundamental modifications necessary on the ACS platforms. Here, structure-related details and openings for the cables had to be taken into consideration. Climbing was done hydraulically without the need of a crane and around four metre high segments were concreted in regular weekly cycles. |
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PERI scope 01/2006 UK
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