Vibration Monitoring: Reducing Liability

June 26th, 2015

VMGeoBlast2For years, Geotechnology has been helping protect structures and reduce its clients’ liability related to vibrations from construction, demolition, or other industrial activities by performing precondition surveys and vibration monitoring services. Historically, vibration monitors have required ample space for setup, a well-founded protective system from the always chaotic construction or industrial environment, and plenty of “baby-sitting” hours for instrument setup, maintenance and data downloading. For these reasons, we are excited to have recently enhanced our vibration monitoring capabilities with
the use of a wireless and internet-
based vibration monitoring network.

INFRA Net2The vibration monitors provide automated, wireless transmission of data to Geotechnology via the INFRA Net website which saves time and enhances productivity throughout the duration of each project. The vibration monitors are compact, waterproof, and portable, each containing a geophone, datalogger, and communications capabilities. The small size of the vibration monitors makes them easy to mount on structures or couple to the ground in relatively out-of-the-way places with no wires to get in the way. The web-based software allows us to remotely set up, program and track the status of vibration monitors. The monitors send out immediate automatic notifications via text or email to assigned contacts at Geotechnology, Inc. in addition to the owner, project manager, etc., if a pre-assigned vibration threshold is exceeded. Also, recorded maximums can be plotted and analyzed over a pre-set time interval. Waveforms can be analyzed and reported immediately upon collection and without being on site. The internet-based system has allowed Geotechnology to provide more responsive vibration monitoring results with less effort and cost.

Non-Destructive Testing, Faster

February 20th, 2015

Hilti screen shotWhy is the new Hilti PS1000 such a useful tool?

  • Avoid damaging internal reinforcing and conduit during coring, drilling or saw cutting projects.
  • Determine reinforcing bar and other object spacing and depth during structural evaluation projects.
  • Determine pavement and slab thicknesses and anomalous areas (such as voids) on highway and building projects.
  • Can be used in place of x-ray, without the use of harmful radioactive sources.
  • Can be conducted without evacuating the area or with little site preparation.
  • Can be rapidly deployed covering several locations per day, saving time, reducing overall project cost, and reducing the potential of cutting or drilling into concrete reinforcements.
  • Can locate live electrical wires in the concrete

What is concrete scanning?

The concrete scanner is used to locate reinforcing steel, electrical conduits, post-tensioned cables, metal and plastic conduits, glass-fiber cables, wood, and voids in concrete structures up to 12 inches deep. It is also used to evaluate existing floor slabs, bridge decks, balconies, tunnels, and post-installed rebar connections and to check slab thickness.

How does the Hilti PS1000 work?

Hilti in useThe PS1000 uses ground penetrating radar (GPR) to image targets that are different than the concrete being scanned. GPR sends high frequency radio waves into the subsurface and measures the travel time for the returning reflection. Reflections are caused by a change in material.

The three antenna system offers the only top down plan view in the market along with a cross-sectional view for easier data interpretation. The array collects a six inch wide area with one swipe, allowing for faster and more accurate results. The scanner is also equipped with an EM senor that allows detection of live electrical cables to a depth of 3 inches at low and medium current levels. Higher current levels are possible to detect deeper in the slab. When working around live currents, the EM sensor is a great added level of protection. Data can be viewed on a field monitor in 3D and PDF’s can be created for reports.

The PX10 transpointer tool is used to transfer the starting point for drilling through-holes to the other side to reduce the risk of hitting obstructions. It also has the ability to measure the total wall or ceiling thickness, regardless of material type.

For more information on CMT, NDT services or specifically on the Hilti Concrete Scanner contact your CMT Manager. Justin Donovan in Memphis, Tennessee; Steve Damron in Overland Park, Kansas; Luke Heuerman in Fairview Heights, Illinois or Jeff Klein in St. Louis, Missouri.

Geophysics Group Purchases New Equipment

November 12th, 2014

Geotechnology’s Geophysics Group has recently purchased new borehole natural gamma, spontaneous potential (SP), and resistivity tools, in addition to an acoustic televiewer (ATV).  With these borehole geophysical tools we provide valuable data for advanced geologic projects requiring evaluations such as stratigraphic profiling, joint/fault analysis, water resource/water production evaluations, contaminant migration mapping, and rock strength assessment.

ATV and rock coreThe ATV (QL40-ABI) allows us to image detailed features on the inside wall of bedrock core holes. Now we can ascertain in situ widths of solution features and the presence of void-space or in-filling material. In addition, we can accurately determine the attitudes of planar features that intersect the corehole.  Now we can plot and analyze the orientation of fractures between different borings or at different levels within borings. (The areas depicted in blue on the adjacent figure represent clay filled partings and the red lines depict bedding planes and joints).

SP and resistivity logs are collected using a QL40-ELOG tool. The ELOG records four resistivity measurements (at electrode spacings of 8”, 16”, 32” and 64”), SP and single point resistance (SPR) in a single pass. This data is useful in groundwater studies to determine water production depths, aquifer thickness, water quality and permeability.

We use another tool, the QL40-GR, to record the natural gamma radiation emitted from geologic formations. This is a great tool for detecting clay and shale layers.

Geotechnology has a long history of providing valuable borehole geophysical data for our clients and we continue to develop our capabilities by acquiring new equipment. These new borehole geophysical tools allow for even better borehole correlation with our surface geophysical data.

Microsoft PowerPoint - More images.pptx

(Stratigraphic profiling)

For additional information, please visit geotechnology.com or contact our geophysics group manager: Doug Lambert, R.G.

 

20-Ton CPT Rig Goes Anywhere, Performs Multiple Services

March 3rd, 2014

image for web_rig_equipment

Geotechnology, Inc., a leading provider of geotechnical and environmental engineering, geophysics, water resource management, materials testing, and drilling services, has purchased a Cone Penetration Testing (CPT) Rig, becoming the only geotechnical services firm in the region to own such equipment.

Cone Penetration Testing is a process whereby soil characteristics can be identified by pushing a cone penetrometer into the soil. The CPT provides a constant, rapid, and reliable means of determining soil stratigraphy, relative density, strength and hydrogeologic information (static and dynamic pore pressure, hydraulic conductivity).

Manufactured by Vertek, the all-weather, 20-ton tracked rig, combines the testing equipment and drilling platform, can be mobilized for many terrains or be positioned on a floating barge, without having to be anchored.  The rig is also equipped for shear-wave subsurface testing, which normally requires separate equipment and crews.

“This significant investment for Geotechnology represents a win-win situation for our firm and for our valued customers,” said Ed Alizadeh, President and CEO of Geotechnology, Inc. “Owning this critical piece of equipment instead of having to rent it means faster deployment and improved efficiency, which results in our customers saving time and money.”

Geophysics, SuperSting R8

January 15th, 2014


Geotechnology is excited to have recently purchased one of the newest geophysical tools available –  a SuperSting R8 Resistivity Meter with Wi-Fi capability.  The new instrument gives us the powerful ability to quickly collect resistivity data using 56 electrodes (expandable to 112) and to efficiently email data from the field to the office using Wi-Fi technology for speedy processing and analysis.  The instrument is manufactured by Advanced Geosciences, Inc., which advertises that the SuperSting provides the highest accuracy and lowest noise levels in the industry.

For many years Geotechnology has used multi-electrode resistivity systems for imaging depth to bedrock and karst features, including voids in soil and rock.  Now, with Wi-Fi capabilities for transmitting data in near real time, we can quickly collect, process and analyze initial data while the geophysical crew is still in the field.  Based on the expedited analysis of the collected data, we can adjust the locations for collecting subsequent data in order to better image and evaluate subsurface geologic features.  Geologic information, project schedules and the overall value of our resistivity surveys are improved without adding cost.

Geophysicist Michael Joseph demonstrating SuperSting