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GEOTECHNICAL WORKS
GROUND ANCHOR
A ground anchor is a restraining device that is installed in natural or man-made formations or structures (e.g. rock formations and earth retaining structures). Ground anchors are stressed using tension anchors to prevent structural movement, and are designed to transfer loads from these formations and structures to a fixed and stable foundation. Ground anchors may either be temporarily or permanently used to support formations, foundations and structures.
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SOIL NAILING
Soil nailing is used as a solution to stabilise steep slopes whereby reinforced elements (e.g. steel bars or rods) are inserted horizontally at regularly spaced drilled holes across the surface of the slopes. The drilled holes will then be filled with cement grout, and thereafter, guniting works will be undertaken.
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HORIZONTAL DRAIN
Horizontal drains are installed in slopes to reduce water-induced instability by redirecting groundwater.
Our Group installs horizontal drains by drilling holes through the slope and laying the drainage pipes in the drilled holes. The drainage pipes contain holes, and are wrapped with geotextile to prevent soil from entering the drainage pipes.
HYDROMULCHING
Hydromulching is a slope greening method undertaken to protect slopes from erosion, instabilities and weathering, through slope vegetation. In addition, hydromulching also provides landscaping benefits.
It is involves the spraying of seeds, fertilizer, mulch and a form of binder onto the slope surface. Once sprayed, a biodegradable interlocking mat is formed on the slope surface, allowing for moisture to be retained to encourage seed germination. Slope may be reinforced with wire mesh in advance, in order to increase soil strength.
GROUTING
Grouting refers to the use of cement mortar to fill cracks and cavities below the ground and/or foundation works, in order to reduce water permeability, increase the stability of the foundation, and improve the underground soil properties. Our Group’s grouting techniques for ground improvement include jet grouting, compaction grouting, tube-and-manchette pressure grouting as well as chemical grouting. The use of different grouting techniques depends on various factors, including soil properties and ground condition as well as cost considerations by our customers.
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