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Sat 10 Feb 2007 12:00 AM

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Dynapac vibratory pokers picked for Nass slab work

Main contractor Nass Burhan Joint Venture has started construction of Bahrain's King Hamad General Hospital in a 27-month contract, using nine Dynapac vibratory pokers for the slab concrete pours

Main contractor Nass Burhan Joint Venture has started construction of Bahrain's King Hamad General Hospital in a 27-month contract, using nine Dynapac vibratory pokers for the slab concrete pours.

Nass Contracting is working on the project with Kuwait-based Burhan International Construction Company.

In the first phase package, the contractor is using three electronic-drive AX56's and six petrol-driven vibratory pokers, together with Dynapac pokers transferred from other projects being undertaken by Nass in Bahrain.

"We were very impressed with the improved finish of the concrete with the Dynapac poker, [which is] able to vibrate over a 100mm distance, eliminating any air bubbles," said Mr Mustapha, construction manager, Nass Contracting.

The AA series of pokers relys on Dynapac's balanced single-piece rotating pendulum, which distributes vibrations equally over the complete poker tube, ensuring efficient vibration at 1,200rpm.

Featuring a tube diameter of 27mm, 37mm and 47mm, the AA series pokers provide a tube length of 335mm, 385mm and 440mm respectively.

The electric AX56s are used in conjunction with Dynapac's AG21 series of electric-drive units. The 1.3kW power packs are double-insulated and splash- proof and feature overload protection.

Incorporating a square design with a top handle, the converters can be placed on the ground or be handheld during operation. The AX56 poker has a tube diameter of 56mm and a tube length of 380mm with a 5m hose length.

Working on a grid system across the three blocks, Nass will be paving a 150mm slab using C40/45 grade concrete.

Poker vibrators are used to remove air bubbles from slab work, improving strength and durability of the concrete.

The King Hamad Hospital is located North of Sheikh Isa bin Salman causeway and will include 312 beds when it opens. Featuring four floors the project will include three buildings providing a total built-up area of 62,000m
²

on a 227,000m
²

site.

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