While soil and foundation remain as our bread-and-butter business, we strive to become a one-stop total construction solutions provider. System Drillers Geotechnical Specialist Sdn. Bhd. (‘SDGS’) has 33 years of expertise and experience in geotechnical field since 1981. Being a market-driven player, (‘SDGS’) is committed to continuous improvement and has been growing and developing in tandem with the industry. In doing so, the company has expanded its portfolio of services to include the following:
- Soil Nailing
- Horizontal Drainage
- Rock Bolt
- Rock Dowel
- Ground Anchoring
- Rock Netting
- Rock Fall & Weathering Protection
- Concrete Buttress
- Soil Investigation
DEFINITION OF SLOPE STABILISATION WORKS
SOIL NAILING is a construction technique widely used in Malaysia which involves the installation of grouted HT bar that allows the safe over-steepening of new or existing slopes. It is crucial to make sure that the designed length for soil nail are sufficient especially in meeting the main design criteria for soil nailing where the installation length for soil nail is to cut through slope slip circle thus preventing the slope from sliding down.
GUNITING is a construction technique that involves the mixture of sand, cement and water along with steel wire mesh BRC to form a ‘waterproof’ layer to prevent seepage of water into the slope during rain fall. Guniting is often used as a finishing for soil nailing works to prevent slope erosion.
HORIZONTAL DRAIN is an effective construction method that involves the installation of perforated PVC pipe wrapped with layer of geotextile used in releasing the pore water pressure trapped within the slope. The drilling operation for Horizontal Drain is carried out by drilling upwards a certain angle so that the water manages to flow out from the slope. Where high water table is observed on site, Horizontal Drains are being installed at the lowest possible points in order to intercept the water stream effectively. It can be used in long term for slope stability as it serves as a control for water table within the slope from going up.
GROUND ANCHOR is an earth retaining system used in transmitting applied tensile load to the ground. Ground Anchor involves the installation of grouted tendon steel bar or steel strands where the steel bar or stands are required to be pre-stressed to a certain loading before locking it. It is often used in basement construction to further strengthen the foundation wall system put in place. In general, there are 2 types of ground anchor, namely temporary ground anchor and permanent ground anchor. Temporary ground anchor is also known as removable anchor where the grouted strands are to be removed after a certain period of time due to embedment or encroachment of grouted strands into neighbouring land is strictly prohibited in long term. Permanent grout anchor is the opposite and grouted strands are not required to be removed from the ground.
ROCK BOLT is a construction technique used in rock stabilisation that involves bolting or anchoring of grouted HT bar into a hole drilled into rock. Where big unstable rocks are observed and it is dangerous to descale or remove it, Rock bolt is used to anchor the rocks in place thus preventing the unstable rocks from falling.
GROUTING is an effective construction methodology that involves the mixture of aggregate, cement, water or sometimes admixture (eg. bentonite) used specifically in filling up voids and fissures in rocks with the use of packers and high pressured grout pump.
ROCK NETTING is a rock slope preventive measures which involves the installation and anchorage of hexagonal wire mesh on top and bottom of rock slope and to be strengthened with wire ropes and binding wire with the aim to trap the loose rocks from falling down.
ROCK FALL BARRIER is also another rock slope preventive measures similar to rock netting. However, its priority aim is to prevent loose unstable rocks from spilling over or rolling down to the roads. Rock Fall Barrier uses a higher strength wire mesh with the ability to absorb, withstand or to neutralise the momentum impact of falling loose rocks. Steel pole will be put in place to support the wire mesh and the wire mesh is required to be tied back with wire rope to the ground. Thus, further enhancing the resistance force provided by the Rock Fall Barrier System as a whole.
MICROPILING is a construction technique used mainly in foundation works for superstructure buildings or even bridges which involves small diameter (6’’-12’’) drilled and grouted in-situ non displacement pile that is typically reinforced by used oil pipe (API) and HT bars cage. Micropiling is selected as part of the foundation system because it is economical and flexible as it can be used in conjunction of other types of foundation system. A good example will be the Micropile-Raft Foundation.