The track truck is the ideal mix of
truck and crawler. This 23 tonne rig can be used as a normal truck on the road
so movement from site to site is relatively quick comparing to low loader moves
necessary for a crawler rig.
Once on site the tracks can be lowered
to make access onto muddy or softer grounds possible.
Lankelma has a total of 5 low ground
bearing rigs available. Where the ground is too soft for the truck we can use
our 14 tonne crawler down to our bogskipper.
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In June 2001 the Lankelma Group received two new
track trucks from AP van de Berg. One is for the Dutch Group the other one is
for Lankelma CPT Ltd. Based on a Scania truck this right hand drive truck is
intended solely for the British market. The truck has been bought for £170,000.00.
One truck is intended for use solely within the
British market and will be equipped with right-hand steering. The other truck
will be used for work in mainland Europe, mainly France. The trucks have the
newest equipment with touch screen computers, e-mail facility and global
positioning systems. Click here to view video of in
truck email facility
In addition to the traditional method of cone penetration
testing methods, we are also able to carry out Mostap sampling and mechanical
CPT's. We also have available in the UK a crawler rig and a 6 x 6 truck, whilst
the equipment in mainland Europe consists of a track truck, a 1.5 tonne crawler
and mobile rigs.
Click picture to view video of working inside truck
Projects
Tilbury Pull Out Resistance
Tests – Tilbury Docks
At the request of Keller Ground Engineering,
Lankelma has just completed a phase ground investigation as part of the installation
and testing of Lime Cement Columns at Tilbury Docks, SE England.
The works comprised of Cone Penetration
Tests and Mostap sampling through previously installed Lime Cement Columns and
Pull-Out Resistance Tests (PORTs).
CPTs were used to determine the engineering
properties of the Lime cement Columns. Continuous 65mm diameter Mostap samples
were obtained for subsequent laboratory testing by the Client.
Lime cement columns were installed
as the ground improvement system for this particular site. At selected column
locations, 500mm wide flat vane were installed at the base of the column and
an attached pull-out cable run out to ground level. Following the column curing,
one of Lankelma’s 20 tonne crawler units, with modified 20 tonne capacity
hydraulic rams, was use to connect up to the cable and pull the flat vane to
ground surface.
As with CPTs, the force required to pull the vane through the column back to
ground surface was recorded and downloaded using a modified and calibrated pressure
gauge, data logger and logging software. The results obtained were used to determine
the undrained shear strength (and so working strength) of the individual Lime
Cement Columns tested. The net pressure was determined by dividing the net force
used to retract the vane by the vane’s cross-sectional area. A factor
of 0.1 was then applied to derive the undrained shear strength profile for the
column.
Airport Site Investigation
Over a possession of three night shifts,
Lankelma CPT Ltd completed a site investigation for the construction of a new
taxiway at an airport for Ritchies. Difficulties encountered included the location
of some very important buried services and the time constraints placed on all
workers because of security clearance and flight operations.
Thirty three tests to an average depth
of ≈5.0m were completed on an area of soft grass adjacent to the aircraft
dispersal and main runway that required minimum disturbance of the ground surface
to control the dangers of FOD damage to air-side traffic. The all-wheel drive
‘Track-Truck’ performed impressively in the very wet conditions
leaving behind only flattened grass.
M2 Motorway
Lankelma was asked by W.S.Atkins for
Carillion Highways Maintenance to carry out an extensive test program on the
M2 motorway in Kent. In 19, 6 hour night sessions, a total of 349 tests were
carried out. Factual reporting was carried out on a daily basis. Using cone
testing techniques ensured a cost and time effective investigation.
A combination of different special cones were used in the investigation. Cone
and friction CPT’s were carried out to determine the material and grade
of the chalk layers present. Our new Gamma Cone was used to detect variations
in the natural radioactivity of the stratification. This helps to determine
between the infilled clay and the highly weathered chalk. Finally we used the
videocone for visual confirmation of the material.
Factual reporting was carried out on a daily basis allowing the investigation
to be tailored to the site conditions. Using cone techniques ensured a cost
and time effective investigation.
