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October 2009 ISSUE  - Contractors World, the digital publication for construction, mining, quarrying and demolition industries
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SEPTEMBER 2009 ISSUE  - Contractors World, the digital publication for construction, mining, quarrying and demolition industries
Sept 2009


CP&E
Contractors Plant & Equipment

NOVEMBER 2009 ISSUE  - CP&E - Contractors Plant & Equipment -  the digital publication for construction, mining, quarrying and demolition industries
Nov 2009

 

A Liebherr LB 28 rotary drilling rig is being used by TAG of Vietnam to excavate 56-m deep bored piles for a Hanoi commercial building. VIETNAM
Piling on The Pressure in Hanoi Project

A Liebherr LB 28 rotary drilling rig is being used by TAG of Vietnam to excavate 56-m deep bored piles for a Hanoi commercial building.

Foundation specialist Thien An Group (TAG) of Vietnam is using a newly delivered Liebherr LB 28 rotary drilling rig for the excavation of 56-m deep piles on a commercial building being constructed in the centre of Hanoi.

The contractor has also used a Liebherr HS 855 HD duty cycle crawler crane fitted with a mechanical grab manufactured in TAG’s own factory on the outskirts of Hanoi to excavate 550 m of slurry-walling to a depth of 25 m.

The LB 28 is one of two new units delivered to TAG in the middle of this year, taking the company’s total number of crawler cranes and drilling rigs to six units.

With the 0.8 m-wide slurry wall in place, work has now begun on excavations for the 56 piles needed for the project, each of which is 1.5 m in diameter.

The LB 28 is using a 72 m EMDE 4 fold Kelly bar and a 1.5 m diameter bucket to cut through the multiple layers of impacted and hard clay and gravel until the specified depth of 56 m is reached.

“The bedrock is about 70 m deep, but with wide diameter piles there is no need to go to that depth,” says TAG chairman Mr Dinh Viet Them. “The footprint of the building is relatively small and this number of wide-diameter piles is sufficient for the required load-bearing, even though the soil is relatively soft.”

Mr Tran Nhan Te, Liebherr-Werk Nenzing’s chief representative in Hanoi, says that the LB 28 has been specially modified for Vietnam and other Asian countries.Mr Tran Nhan Te, Liebherr-Werk Nenzing’s chief representative in Hanoi, says that the LB 28 has been specially modified for Vietnam and other Asian countries.

“The standard specification for the LB 28 is a 25 t kelly winch with an 1,100 mm drilling axle, but, for this market, the machine has been equipped with a 30 t kelly winch with a 1,300 mm drilling axle,” he says.

“In Vietnam and other Asian countries in which ground conditions are soft, longer and wider piles are often needed to provide greater friction. Piling to depths of 67 m is fairly common, and this modification enables a Kelly bar of up to 72 m in length to be used.

“We can do this for the LB 28 and LB 36 drilling rigs, adding an ‘XL’ designation to indicate the modification. The components are all modular, so the change in specification is easy to achieve.”

 

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