Asia Baru Construction
 
We are in civil and building construction with particular specialisation in Water Works and Sewerage project ranging from sewerage treatment plant, river intakes, water treatment plants, storage tanks, reservoirs, pipe laying and major diversion...etc
 
 
 
 
PROJECTS > Projek Bekalan Air Alternatif Ke KLIA, Sepang, Selangor

Project Background
Prior to this Project, the water supply to the Kuala Lumpur International Airport (KLIA) which was supplied from the Semenyih Water Treatment Plant had been found to be at risk of disruption. In recognition of this vulnerability, the Federal Government of Malaysia has initiated an alternative water supply scheme to support the existing and future water demands at KLIA and the surrounding areas.

An open tender was called for Construction of Sg. Labu Dam by Jabatan Bekalan Air of Kementerian Tenaga, Teknologi Hijau Dan Air Malaysia and Asia Baru Construction Sdn Bhd was successful in its bid and was awarded the Contract. Briefly, the scope of works under the Contract comprised the following major components:

- River gate, river intake pumping station and associated ancillary works located about 1.6km downstream of the Sg. Chinchang and Sg. Labu confluence. The nominal pumping capacity is 140 Mld with 4 nos. duty and 2 nos. standby pumpsets.

- A 30m high earth fill dam and associated ancillary structures including 3 saddle dams. The total volume of the dam embankment is about 2.0 MCM. The gross reservoir storage capacity is about 9 MCM and cover a lake area of about 70ha.

- Approximately 1.0km long 1200mm diameter raw water pumping main from river intake to the dam, which serves as an off-river storage.

The Contract was to construct all the civil and structural works as well as design, fabrication, supply, installation, testing and commissioning of the pumping system and all associated mechanical, electrical, instrumentation and control system under the Contract. Upon completion of all the works, the Contractor continue to operate the pumping system to fill the storage reservoir until the top water level.
Project Information
Client / Owner: Kementerian Tenaga, Teknologi Hijau dan Air Malaysia (KeTTHA)
Consultant: Asia Baru Construction Sdn Bhd
Main Contractor: SMHB Sdn Bhd
Sub-Contractor: -
Date of Commencement: 28th December 2009
Date of Completion: 27th June 2011
Project Methodology
Upon receipt of the Letter of Award and after fulling all the conditions precedents, topographical survey and site setting out were immediately carried out by licensed surveyor. Meanwhile, the project manager and his team of professional engineers and experienced designers/site supervisors were planning for various critical project requirements such as design of temporary bridge crossing Sg. Labu for access into the site, establishment of Erosion and Sediment Control Plan (ESCP) and proposed river diversion for approval by Jabatan Pengairan dan Saliran (JPS), design of temporary cofferdam for construction of river gate and raw water intake etc.

At site, various construction works adjacent to the existing river Sg. Labu proved to be rather challenging. Upon completion of temporary structural steel bridge spanning across Sg. Labu, temporary river diversion was carried out by excavating a diverted channel of equivalent wet section as per JPS requirement. Upstream face of diverted channel were protected against erosion using inter-locking sheet piles. This enable the construction of river gate structure in a dry condition.

A specifically designed temporary cofferdam using FSP IIIA mild steel interlocking sheet pile properly braced using structural steel were erected for construction of raw water pumping station with invert level more than 10m below ground level sited adjacent to the existing Sg. Labu river. Upon completion of micropile foundation, a thick layer of crusher run was spreaded and compacted at the base slab level to enable erection of RC base slab. Ground water seepage was continuously pumped dry using portable water pump.

Construction for both river gate and intake structures progressed smoothly and were completed as scheduled. All temporary works installed were removed and river course and the vicinity of the site were reinstated to its original conditions to the satisfaction of the authorities concerned, especially JPS.

Unlike the structural works, which were commenced as planned, possession of site for dam area was delayed for about 2 months, due to land acquisition problems. Upon availability of the site, adequate bulldozers, excavators and lorries were mobilized to the site for site clearance works. Existing stream within the dam area was diverted in-line with the permanent diversion culvert to enable construction of earth dam embankment. Foundation grouting, dam structures, i.e. diversion culvert and draw-off tower were progressed concurrently with the dam embankment. Due to the extreme wet season during the construction period, earthwork for dam embankment was initially behind schedule. However, the progress was recovered during fine weather by prolonging working hours until 12:00 midnight for most of the working days with fine weather. The main dam embankment was completed as scheduled (by 27th July 2011, i.e. the 1st approved extended Completion Date due to delay in site possession) and the temporary drainage was successfully plugged ready to receive water from pumping station.

All the mechanical and electrical works including pumping plant were undertaken by our specialist M&E sub-contractor, Messr Chemical Waste Management Sdn Bhd (CWM). All works including system design, preparation of shop drawings, equipment fabrication, factory acceptance test, delivery to the site, installation and site test were satisfactorily completed as scheduled. When all the civil, structural and M&E works were ready for commissioning test by 27th July 2011, it was rather unfortunate that the river flow was inadequate for pumping. Therefore, system commissioning was deferred until wet season in September 2011.

The overall system was finally commissioned in September 2011 and the dam was filled full by the end of November 2011. Raw water was released through outlet at draw-off tower to the water treatment works located about 500m from the dam, which was completed under separate contract implemented by Pengurusan Aset Air Berhad (PAAB).