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OUR SERVICES
BUILD ON TRUST, DRIVEN BY QUALITY
At Geohan, we are dedicated to provide comprehensive and reliable solutions across a range of foundation and structural services. With design and build expertise in foundation piling, earth retaining structure, and slope strengthening works, we support every stage of construction with QUALITY AND PRECISION.
Piling works refer to the installation of piles (i.e. supporting columns) below ground level, to serve as a foundation or support for structures built above ground level. These piles must be built with sufficient strength and durability to support the weight of structures built above them, and should remain stable over a long period of time as well as withstand environmental factors such as strong winds, minor earth tremors, soil movements and underground water.
We mainly provide cast in-situ piling works, which are piles that are cast on site by pouring ready-mix concrete into bored shafts. We undertake various types of piling works, whereby the adoption of each type of piling works depends on various factors, including the type of development, soil conditions and accessibility of the project sites as well as cost considerations of the customers. Our cast in-situ piling works (i.e. bored pile, caisson pile, micropile and barrette pile) are mainly carried out in-house using machinery and equipment owned by our Group. However, in the event of resource constraints such as insufficient machinery capacity or manpower, we may outsource some piling works to subcontractors.
Different types of developments require varying load-bearing capacities, which influence the use of different piling works in a foundation system. For instance, bored piles, which have the ability to reach greater depth and thus able to support higher load, are typically used for high-rise buildings as they require piling works with higher load-bearing capacity.
Further, the accessibility of project sites also influences the use of piling works. For instance, caisson piles are typically used in areas such as hillslopes where machine access is restricted, as they can be constructed manually; whereas micropiles are typically used at space-constrained project sites such as densely built-up or confined urban environment as they caan be constructed with compact machinery and equipment.
As such, a foundation system can comprise a combination of different piling works due to abovementioned factors, thereby satisfying different requirements for different developments.
Earth retaining structural works refer to the construction of vertical structures at project sites to prevent the surrounding soil, rock and other materials from collapsing into the excavated area. Earth retaining structural works may be incorporated as part of piling works, or to be used to build basement structures.
Our Group undertakes various types of earth retaining structural works, whereby the adoption of each type of earth retaining structural works depends on various factors, including the type of development, soil conditions and accessibility of the project sites as well as cost considerations by our customers. Some earth retaining structural works may be more suitable than others in project sites with certain conditions. For instance, for sites with high water table conditions, earth retaining structural works with high water-tightness such as diaphragm walls or secant pile walls are required; whereas caisson walls or anchored caisson walls are typically used in sites with hilly terrains where machine access is restricted. Similar to piling works, an earth retaining system can comprise a combination of different earth retaining structural works.
Geotechnical works involve geological modification and improvement of ground properties in terms of permeability, strength, capacity and density. It plays an essential role in enhancing the stability of soil and foundations built below ground level, which consequently affects the stability of structures built nearby or above the ground level. Our Group’s geotechnical works are mainly carried out in-house using machinery and equipment owned by our Group. In the event of resource constraints such as insufficient machinery capacity or manpower, our Group may also outsource some geotechnical works to subcontractors. There are two (2) types of geotechnical works that our Group provides, namely slope stabilisation and ground improvement works.
Ground improvement works are any form of modification and improvement works performed on the foundation. The ground improvement works that we provide are grouting.
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Sub-structure works refer to the construction of structures below ground level, such as basements and tunnels. Construction of these structures typically involves the excavation of soil to certain depths and the construction of retaining walls to prevent the surrounding soil from collapsing into the excavated area in order to form underground structures.
To complement our foundation and geotechnical service offerings, we also provide other related services such as earthworks, steel strutting, earthing, construction of bridges, roads and drainage upon customers’ requests. These services are either carried out in-house by our Group or outsourced to subcontractors, depending on the type of works and availability of internal resources. Our Group may carry out cut and fill excavation earthworks in-house, subject to the availability of internal resources, whereas earthworks involving soil dumping are outsourced to licensed subcontractors. Steel strutting, earthing as well as the construction of bridges, roads and drainage are generally outsourced to subcontractors, as they typically require specialised machinery and equipment and/or technical expertise that are not equipped by our Group.
