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BOMAG LAUNCHES TRACTOR-TOWED SOIL STABILISERS
German manufacturer Bomag has expanded its range of soil
stabilisers with the addition of two tractor-towed models.
The new non-powered RS300 and RS250 models, which sit EQUIPMENT
alongside the nine powered machine models in Bomag’s RS
product line, are towable machines that enable non-load-bearing
soil to be compacted by mixing in binders that remove moisture.
The 6.7-tonne RS300 and 4.4-tonne RS250 offer milling depths of
up to 50cm and 40cm respectively, and both offer a working
width of 2.5m.
The have been designed to eliminate the need for contractors
to replace non-load-bearing soils onsite. On smaller construction
sites, in particular, using a tractor-towed planer makes more and
more sense. The milling and stabilizer units are an ideal addition Bomag’s RS250 (pictured) and RS300 soil stabilisers are now
to the fleet for construction and service companies involved in available in both Europe and the US.
earthmoving or soil replacement operations. While the RS300 effect motion that ensures the “optimum processing and mixing”
can be towed by a 300-450hp tractor for large stabilisation, soil of soils.
improvement and roadbuilding tasks, the more compact RS250 According to the manufacturer, the feature also keeps fuel
has been designed to be used on smaller road projects - such consumption down when working a lower speeds.
as building embankments and slopes or backfilling - alongside Additionally, the mixing chamber of both the RS300 and RS250 can
tractors in the 200-300hp range. be fitted with an optional water injection system to ensure optimal
The new tractor-towed stabilizers, the highly efficient Bomag cement hydration over the full milling width. When stabilizing, there
technology for milling, mixing and stabilizing can now be used is no need to replace non-load-bearing soils. Stabilizing is therefore
even more easily and flexibly on smaller construction sites. usually the better choice, both economically and ecologically,
Optimized power transmission and high-performance cutting compared to removing reusable soils. This is also required by the
technology meet sophisticated and maintenance-friendly German Waste Management and Product Recycling Act (KrWG).
holder systems. They guarantee maximum milling performance, By mixing in binders such as lime, this method removes moisture
uniformly smooth surfaces after milling and comparatively low from the soil on site, thus improving its compaction properties and
fuel consumption. The Bomag RS300 features a large rotor with load-bearing capacity. Through the precisely dosed addition of
a diameter of just under 1.5m that can work with cohesive soils. cement and water as a hydration shell, even non-load-bearing
The rotor is equipped with large, double cutting tools with a shaft soils can easily be made permanently load-bearing, firm and
diameter of 25mm that enables the model to produce a shovel frost-resistant.

CATERPILLAR LAUNCHES NEW DROP-IN INDUSTRIAL CHILE TUNNEL PROJECT FOR ROBBINS CROSSOVER
POWER UNITS A Robbins XRE TBM 4.6m diameter Crossover machine bored a
Caterpillar has introduced a range 3.3km tunnel in the Andes Mountains for Chile’s Los Condores
of drop-in diesel engines which are Hydroelectric Power Project (HEPP) and project owner Ene.
said to offer ease of installation and The team, including three Robbins Field Service personnel,
robust design. guided the machine to breakthrough in conditions including tuff,
The new Cat C2.8 and C3.6 industrial sandstone, breccia, and conglomerate with sections of high-
power units (IPUs) have common pressure water inflows. The ground cover reached up to 450m
rail direct injection with a turbo above the tunnel with rock strengths maxing out at 60 MPa UCS.
or intercooled turbo intake setup. For Riveros Puratic, project engineer for Enel, Crossover machines
Featuring an integrated design, the make sense despite the challenging conditions, “Towards the end,
engines meet EU Stage 5, US EPA Cat C3.6 IPU engine [the TBM] exceeded expectations. Crossover TBMs are suitable for
Tier 4 Final and Japan 2014 (Tier 4 Andean geology of sedimentary and volcanic type, where there
Final) emissions standards. The engines offered in ratings up to is a great range of rock strengths and hydrogeological conditions.”
55 kW (74 hp) at 2400 rpm for the C2.8 and up to 100 kW (134 Maximum advance rates topped out at 605.8m in one month and
hp) at 2200 rpm for the C3.6. Other features include full engine- 212.8m in one week. The Crossover machine featured a heavy-
mounted aftertreatment and an integrated cooling package duty, centrally mounted screw conveyor for the duration of the
(heavy-duty cooling pack also available, with a pusher fan and drive. The TBM remained in a hard rock configuration with a muck
erosion screen). A pre-installed ECU and bespoke wiring harness chute installed, along with paddles, bucket lips, scrapers and
is also included. The C3.6 also comes with a multi-rating flash file disc cutters on the cutter head. However, “75% of the excavation
which can be configured to suit various power nodes. was performed using the main drive gearboxes in high torque
The power units are intended for construction and materials configuration (EPB or low-speed mode). We never physically
handling applications. They offer full after treatment mounting, changed the cutter head or screw conveyor to EPB mode,” said
plus mounting for the ECM and fuel filter. Omar Alvarez, Robbins field service site manager at Los Condores.

FEBRUARY 2022|CONSTRUCTION OPPORTUNITIES 67