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Drilling Rig for Construction of SMWBored Pile Drilling Rig
|SMW, which is short of Soil Mixing Wall, is a construction method developed in Japan in 1976. Now it consists 50% of underground continuous wall constructions in Japan, and widely adopted in countries in southeast Asia, the United States, France etc. In Shanghai, Hangzhou, Nanjing and other cities of China, SMW becomes quite popular after its introduction years ago.|
SMW uses multi-shaft auger to drill soil in situ, meanwhile pumps cement grout from the tips of the augers into the drilled holes. After sufficient mixing of the grout, H-shaped steel or other types of steel are embedded into the columns before the soil-cement mixture hardened, forming a underground continuous wall with rigidity and intensity. The wall could be used as retaining support or water seal. Three-shaft auger machine is commonly used.
|SMW method has the following advantages:|
|1.Low cost. Foundation retaining using SMW method with three-shaft auger machine is much more competitive in price than traditional method when constructing underground continuous wall.|
2.Shorter construction period. SMW method consumes much less time than other methods. Under normal geographical conditions, it could build 70-80m² walls per shift.
3.Good seal quality. The wall is continuous without any cracks. Hydraulic conductivity can reach as much as 10-7cm/s.
4.No disturbance in nearby soils. SMW method would not cause hazards like ground subsidence, building inclining, road cracks or shift of underground facilities.
5.Wide range in use. It can be applied on cohesive soil, silt , sandy soil, gravel soil.
6.the waste soil is far less than other construction methods.
|Center distance of rig||mm||450|
|Max drilling depth||m||30|
|Max output torque||kn·m||84|
|Rod rotary speed||r/min||20|
China National Building Materials Group Corporation is the full name of CNBM, which is one of the largest state-owned group in China. In 2013, the total asset of CNBM exceeds US$60 billion dollars with a total staff of 180,000. CNBM is listed in the World Top 500 Enterprises!
CNBM International works as the international platform for CNBM Group. In 2013, our total sales income was more than US$16.8 billion dollars.Every year we import large quantity of iron ore, coking coal and thermal coal etc from India, Brazil, Australia and Russia and other countries.ld'>Our major responsibility is international marketing of different construction machinery & formwork, including lifting machinery, concrete machinery, earthmoving machinery, brick/block machinery; steel frame formwork, H20 timber beam formwork, aluminum formwork etc.
Our major responsibility is international marketing of different construction machinery & formwork, including lifting machinery, concrete machinery, earthmoving machinery, brick/block machinery; steel frame formwork, H20 timber beam formwork, aluminum formwork etc.
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