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Contractors World 2012 Volume 3 Issue 2
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Ukraine: Cost-effectively forming geometrically challenging twin suspension towers

Versatility demonstrated in each individual concreting sectionVersatility demonstrated in each individual concreting section

Up to where the cross-beam ties in at the sixth concreting section, the legs of the towers are inclined at an angle of 5.3º off the vertical. Above that beam level, the tower legs are climbed at an angle of 5.6º.

The polygonal cross-section tapers 5 cm per concreting section. Aggregated over the total of 40 concreting sections, that equates to a difference of 2 metres between the first and last sections in the towers’ tapering cross-section.

The hollow-section cross-beam is 6 metres high and 20 metres long to carry the roadway slab and is formed with Doka Top 50 large-area formwork. This formwork is supported at the airy height of some 25 metres with Staxo 100 load-bearing towers.

The integrated ladderways and a multiplicity of attachment options for personal protective equipment enable the falsework towers to be erected rapidly and, even more importantly, in total safety.

Starting from the top surface of the cross-beam, the automatic climbing platforms are set to the new angle of 5.6° from the vertical. A catwalk, suspended from the self-climbing system, forms another connecting link between the two legs of the tower.

The walkway means that per tower, one passenger hoist is enough to bring the crew to their workplaces. The catwalk is a special solution developed specifically for this build by Doka. It adjusts perfectly to the narrowing gap between the two inward-inclined, converging legs of the towers: individual sections become superfluous as the build progresses and are simply removed.

Site foreman ensures smooth progress

Aware of its lack of experience in automatic climbing, lead contractor Mostobud knew that professional training of the site crew in the correct assembly and handling routines for the formwork equipment by an experienced Doka site foreman would be crucial to ensuring smooth and rapid progress on the build.

“The assistance we received from the Doka site foreman enabled us to make full use of the advantages of automatic climbers right from the very first concreting section onward”, says Project Manager Volodymyr Klymenko with complete conviction. By the same token, in-depth planning of formwork sequencing and continuing support for the site contributed significantly to the success of the project.

Click here fore more information >>> Doka shoring and formwork

The new Nitto Construction CTS-02v4 Concrete Tester and Surveyor accurately measures high strength concrete (up to 150N/mm²), regardless of concrete condition. Advanced Concrete Tester and Surveyor

The new Nitto Construction CTS-02v4 Concrete Tester and Surveyor accurately measures high strength concrete (up to 150N/mm²), regardless of concrete condition.

This upgraded model measures the compressive strength of concrete two times faster and with more precision than conventional rebound hammers.

This non-destructive testing tool measures and analyzes the strength of concrete by the waveform of impact force at the point of hammer and concrete contact and calculates the deterioration and delamination condition. A built-in accelerometer measures blow force.

Using the measuring plane concept, the hammer tests concrete areas by dividing testing blocks. After hammering concrete twenty times, the mean value with ±20% is automatically generated. Measurements outside the range can either be saved internally or automatically discarded. After each hit, the result is displayed in 0.5 seconds.

Contrasted with a rebound hammer, the CTS-02v4 requires no polishing of the testing surface and causes no damage to the concrete surface. The hammer is equipped with USB connection to allow data to be directly exported and stored to a PC. A CSV file of the results can be exported, and further analysis using spreadsheet software is possible.

Available worldwide, the hammer is proven and accepted as a new construction site testing tool, existing construction site monitoring and quality assurance testing, defect inspection and other applications involving concrete structures.

Click here for more information >>> Nitto CTS-02v4




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Page updated: February 2012



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