|
When it came to building the two 164 m tall pylons for the 941 m long Southern Bangkok Ring-Road Bridge, the Doka Formwork Experts had some tough challenges to master. Using Doka Automatic climbing formwork SKE 50 enabled the complex structure geometry, with its varying cross-sections and angles of inclination, to be tackled efficiently, swiftly and safely.
|
|
 |
|
|
Using Doka Automatic climbing formwork SKE 50, the complex structure geometry of the pylons, with their varying cross-sections and angles of inclination, was tackled swiftly, safely and highly efficiently.
|
|
|
|
|
Slanting towards one another and tapering as they rise, the pylon legs made some very tough requirements indeed in terms of the flexibility and adaptability of the Doka automatic climbing formwork SKE 50 used here. The fast, safe way in which the formwork units could be adapted to varying cross-sections and inclinations made for an optimised construction workflow. The necessary modifications to the Doka climbing formwork could be made directly from the working platform. A total of 32 hydraulically operated automatic climbers were in service on each tower.
Maximum adaptability
For statical reasons, the pylon legs up as far as the first cross-member were built with a hollow cross-section comprising two differently sized shafts. The formwork for the smaller of the two shafts was re-used for the top part of the pylon (which only required a single hollow cross-section), and was quick and easy to adapt.
From the 30th casting section upward, steel boxes with fixing sleeves also had to be integrated in the pylon legs, for installing the post-tensioned cables. As it was not possible to place through-ties through the steel boxes, Doka reinforced the formwork and added extra reinforcement anchors. Another formwork-technology challenge was to form a hollow wall between the pylon legs above the second cross-member. Using a combination of Automatic climbing formwork SKE 50 and Climbing formwork MF 240 made it possible to cast this upwards-tapering hollow wall with significant savings in terms of both time and equipment.
“Thanks to the Doka automatic climbing formwork we were able to form the complex structure geometry quickly and safely, and to make up for the delays we had had at the start of work”, noted contractors’ supervisor Pornnarong Siriyothin, evidently impressed by the performance of the Automatic climbing formwork SKE 50.
|
|
Contractors: Ch. Kamchang Public Comp. Ltd.
Formwork consulting: Doka Applications Technology Dept., Amstetten, with Subway Engineering, Bangkok
|
|
|
|
|
 |
Articles |
|
|
 |
|
