RIC is a technique allied to Dynamic Compaction that can be used to increase the bearing capacity of soils through controlled impact.
The treatment is effective in the top layers typically up to 6m depth, though improvements up to 9m have been seen in some conditions. A drop weight of 9 to 16 tonnes (depending on size) is dropped onto a special foot assembly 40-60 times a minute. The foot remains in contact with the ground at all times.Read More
The method for efficiently covering the ground varies from country to country. A common pattern used to cover uses a track in three passes. This has the effect of achieving the best depth of influence. The first pass effecting the ground to a deeper level than the latter.
Most granular fills and some silts are compactable, the best results being achieved where the fill is well-graded particle size. An area of 800m²-2500m² can be covered in an average day (depending on the ‘blow-perposition’ setting.) This also allows time for routine maintenance and rotation of the special dolley pads located in the foot assembly which transfers the force of the blow through to the ground.
A monitor unit is used to record work done. Target criteria settings are adjusted
for final set, depth and blow counts. The driver then compacts until one of those
criteria is reached before moving the machine on. A visual representation of
the data is seen in the cab and recorded by the on-board monitor.
A GPS receiver option is available and GPS coordinates may be added to the
compaction points. This allows the data logged to be precisely allocated to real
position. Data presentations to the client can then be greatly enhanced.
RIC activities can be combined with other soil improvement techniques to provide a cost effective solution for silty/clay conditions. This essentially includes soil mixing and stone columns. To make best use of the base excavator, BSP-TEX offer a mast and drill attachment for the RIC9000 boom, that enable shallow holes to be drilled with either CFA or displacement type tools. Filled with stone, these columns can be subsequently treated by RIC to produce a more effective load bearing foundation.
The unit is mounted on standard excavators and can be mobilised in minutes from arrival on site
The machine is accurately controlled from the excavator cab and the degree of compaction electronically monitored
The impact foot is always in contact with the ground and eliminates the risk of flying debris. Unlike conventional DC, other activities can take place in proximity
The impact energy and soil deflection are recorded by the on-board computer for presentation of compaction data to site managers. The data can highlight weak zones where extra fill is required or zones where underground obstructions were present
RIC is potentially twice as fast and at least 40% cheaper than conventional methods
BSP-TEX offers sound attenuation for its Mk.3 range of Rapid Impact Compactors
Accessories for the RIC9000 boom include a MX45-8 mast, drill tools and vibroflot
|Dropweight Mass (kg)||9000|
|Hammer Energy (kN.m)||110|
|Max Equivalent Stroke (m)||1.20|
|Operating Pressure (bar)||260|
|Hyd Oil Flow required (L/min)||250|
|Optimum Blow Rate||35|
|Height in Working Position (m)|
|O-All Length in Lowered Position (m)|
|With Noise Suppression Features?||No|
|Compatible Excavators (T)||4552|
|Typ Depth of Influence (m)||35|
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