Project Highlights

Pavilion Damansara Heights (Phase 1)

Scope of Works: foundation, retaining wall and basement works

The project site is located within Damansara Heights between 2 MRT stations – Semantan and Pusat Damansara. Phase 1 footprint alone is 9.573 acre. The contract entails the removal of existing foundation of demolished buildings as well as the construction of bored pile foundation, retaining wall system and 8- level basement.

The basement is one of the largest and deepest ever constructed in the region with a massive floor plate area of approximately 300,000m2. The total depth from existing ground level to lowest slab is approximately 31m excluding the deepest lift core construction which required another 10m depth of temporary shoring works.

Approximately 900 points of bored piles with diameters ranging from 750mm to 3,000mm were constructed in Kuala Lumpur Kenny Hill formation.

Existing surrounding dense environment and Sprint Highway had precluded the construction of deep basement using conventional open cut method and tie back system using soil nail/ground anchor due to encroachment issue by site boundary.

Top-down construction and semi top-down construction methods where floor slabs are utilised to strut against the deep basement wall while excavating downwards are adopted. The top-down work sequence adopted alternate basement permanent floor (B3, B5 & B7) as strutting slabs against the contiguous bored pile (CBP) basement wall.

Sequence took into consideration of basement slab (including temporary openings to facilitate earth removal and concreting works of lower floors) and CBP wall in modelling, design, logistic and construction work aspects.

MAS Building Annex Redevelopment

Scope of Works: foundation, retaining wall and basement works

A 37m deep excavation was carried out to construct a 6-level underground basement at Jalan Sultan Ismail in downtown Kuala Lumpur. On top of being situated very close to the Raja Chulan monorail track, the site is located next to a busy road with heavy traffic, high-rise buildings and the existing MAS Building. The project demanded control of minimum lateral wall movement, minimum soil settlement, and timely completion in a very limited site area of about 2,400m2.

Major works for phase one included demolition of the front podium and removal of existing 450mm∅ CBPs. Second phase involved installation of new CBPs ranging from 600mm∅ to 1,350mm∅, of an average depth of 45m and 3,000mm∅ foundation bored piles of an average depth of 70m. The semi top-down construction method with kingposts was adopted, in place of installation of temporary steel struts and walers to support deep excavation. 6 basement slabs were constructed and the volume of earthwork was approximately 82,000m3.

Sungai Besi-Ulu Kelang Elevated Expressway (SUKE) Package CA3

Scope of Works: foundation, substructure and ancillary works

The contract entails the construction of over 1,000 bored piles and 50 caisson piles for package CA3 starts from CH. 4200 to CH. 7800 with total length of approximately 5.2 km in Alam Damai, southeast of Kuala Lumpur.

This project is of particular engineering importance as it showcases the pioneering expertise in large diameter hard rock drilling using down-the-hole (DTH) hammer in challenging rock formations. With percussion boring, the DTH technique, compared to conventional rotary drilling, has been proven to be significantly more efficient in hard rock areas. DTH hammer was used to drill 200 points of large-diameter bore holes for the project (with 1,200mm⌀ and 1,500mm⌀ casings through hard granite strata).