湖南方运重工科技有限公司 HUNAN FAE HEAVY INDUSTRIES CO.,LTD. TOGETHER WE FORGE AHEAD

Deep Soil Mixing Rig

Overview



The Deep Soil Mixing(DSM) is an in situ soil treatment technology whereby the soil is blended with cementitious and/or other materials. These materials are widely referred to as “binders" and can be introduced in dry or slurry form. They are injected through hollow, rotated mixing shafts tipped with some type of cutting tool. The shaft above the tool may be further equipped with discontinuous auger flights and/or mixing blades or paddles. These shafts are mounted vertically on a suitable carrier, usually crawler-mounted, and range in number from one to eight(typically two or four) per carrier, depending on the nature of the project,the particular variant of the method, and the contractor. Column diameters typically range from 0.6 to 1.5 m, and may extend to 40 m in depth. In some methods, the mixing action is enhanced by simultaneously injecting fluid grout at high pressure through nozzles in the mixing or cutting tools.
The cemented soil material that is produced has a higher strength, lower permeability, and lower compressibility than the native soil, although total unit weight may be less. The exact properties obtained reflect the characteristics of the native soil, the construction variables (principally the mixing method),the operational parameters and the binder characteristics.
DSM technology is based on a stimulating concept of improving natural soils or brown field ground to match adopted design requirements, so eliminating problematic excavation and replacement or more expensive deep foundation methods. Wide application range and variable patterns of execution of soil mixing columns allow for obtaining safe and very economic ground engineering solutions. The use of non-toxic binders as soil additives, including industrial by-products,as well as reduced spoil volumes comparing with jet grouting or classical drilled piles, for example, allow to position DSM as an environmentally friendly technology. Soil mixing technique is performed by using hollow drilling rods with augers or special made paddle tips. The mixing can be executed using dry or wet technique. While Dry Mixing is a treatment of the soil with dry cementitious binder to construct a single column, Wet Mixing (or Deep Mixing)consists of mixing cement with soil to form a mixture, to treat also large soil areas.
Wet Soil Mixing is executed by applying low or high pressure cement injection through the drilling rods that flow at the bottom by means of nozzles applied to the drilling tip. The technique requires to withdraw the drilling tools during injections up following to the designed mixing result and controlling the injected cement mixture pressure.
It is a soil improvement and consolidation technique but it can be also used as an alternative to trench excavation and for the formation of constructed columns.


FAE
can provide quick assembly for soil mixing to be applied to any piling rig in its range, giving long mast stroke, powerful and fast winches operations, single or multiple rotary heads

 

simultaneous application, specially designed tools.
Application field:
Almost any soft soil type, including organics, mud, clay or loose formations, with presence of water
Features:
No material disposal with no material disposal costs
Fast production
Full control of executed pile features by means of electronic devices

 

SERIESDSM

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