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Contractors World  -
2014 Vol 5 No 5
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OMAN Shoring for Mosque Construction - continued

Carillion Alaw implement strict health and safety proceedures on site

Carillion Alaw implement strict health and safety proceedures on site. The workers are trained in the correct handling and assembly of shoring tower components. Hardhats, gloves, protective boots and high-viz jackets are manadatory - even though the temperature can get very high.

Commenting on the challenges, Carillion Alawi project manager, Mohamed Tariq said:

With the top of the dome needing shoring support at a total height of 43 metres and numerous concrete slabs at different levels making up the new mosque, the key challenge for us was how to manage the safe erection of the shoring.
      Critically we also had to be conscious of the distribution of loads throughout the project, to keep within the allowable working load of the RMD Kwikform equipment.

Having worked with RMD Kwikform on numerous other projects in Oman, including the Wave retail centre in Muscat, where the contractor also used Alshor Plus, they were familiar with the high leg load capabilities of the product. So for the initial sequencing of the project they opted for this solution.

With both Alshor Plus and Rapidshor being modular systems, the Carillion Alawi site teams were able to quickly erect the tower structures safely, bringing forward the concreting element of the programme to meet the needs of the overall advanced programme time.

As part of the revised design of the structure and construction sequencing, that included additional monolithic slabs, which had to be poured at the same time, RMD Kwikform engineers had to install additional equipment without restricting access.

Commenting on revised design and the project RMD Kwikform regional sales manager, Bellphine Campbell said:

With the changes made part way through the project, having calculated all of the loadings, we knew we could not release the loads in the Alshor Plus to strike these additional slabs. We therefore introduced a 900mm wide run of Rapidshor shoring that sat within the Alshor Plus birdcage support to distribute the loads and keep both systems within their loading capacities.
       In doing so, we also recognised the need to increase the size of the working platform, so we designed additional bays using Alshor Plus. To reach the 42 metre top height of the dome structure, we literally put shoring, on top of shoring, on top of shoring.

Due to be completed in 2015, the new Sultan Qaboos Mosque will be one of the largest in OmanWith different segments of the structure requiring different shoring setups, like the two level slabs next to the prayer hall, the shoring puzzle required a great deal of engineering.

Rapidshor shoring, reaching a height of 17m to the top of the dome was arranged at varying heights and the systems jacks were adjusted to support the curved structure of the dome.

The Rapidshor shoring was founded on top of an Alshor Plus birdcage, a staggering 25 metres high, erected from the main 5.5 metre slab. In total this created a record-breaking tower for RMD Kwikform, some 42 metres tall.

Due to be completed in 2015, the new Sultan Qaboos Mosque will be one of the largest in Oman.

RMD Kwikform

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