Vibration and Geo-Instrumentation
Enhancing the safety, resilience, and performance of infrastructure through pre and post-construction surveys
With significant new developments occurring in increasingly condensed spaces, construction-induced vibration damage and its causes are a growing concern. Construction in tight spaces often will result in the need for demolition of existing structures, deep excavations for underground parking, and/or pile foundations that require heavy equipment. Consequently, vibrations induced from the use of heavy equipment such as earthmovers, excavators, drill rigs, and pile drivers will travel quickly through the surrounding ground and potentially negatively affect nearby existing structures. Twining has the in-house capability to accurately measure the level of vibrations created during construction using state-of-the-art equipment and software and evaluate the potential effects on surrounding structures.
We typically provide these services in three phases:
- Pre-construction survey
- Field Monitoring during construction
- Post-construction survey and vibration monitoring report
Vibration and Geo-Instrumentation
Vibration and Geo-Instrumentation
Enhancing the safety, resilience, and performance of infrastructure through pre and post-construction surveys
With significant new developments occurring in increasingly condensed spaces, construction-induced vibration damage and its causes are a growing concern. Construction in tight spaces often will result in the need for demolition of existing structures, deep excavations for underground parking, and/or pile foundations that require heavy equipment. Consequently, vibrations induced from the use of heavy equipment such as earthmovers, excavators, drill rigs, and pile drivers will travel quickly through the surrounding ground and potentially negatively affect nearby existing structures. Twining has the in-house capability to accurately measure the level of vibrations created during construction using state-of-the-art equipment and software and evaluate the potential effects on surrounding structures.
We typically provide these services in three phases:
- Pre-construction survey
- Field Monitoring during construction
- Post-construction survey and vibration monitoring report
With significant new developments occurring in increasingly condensed spaces, construction-induced vibration damage and its causes are a growing concern. Construction in tight spaces often will result in the need for demolition of existing structures, deep excavations for underground parking, and/or pile foundations that require heavy equipment. Consequently, vibrations induced from the use of heavy equipment such as earthmovers, excavators, drill rigs, and pile drivers will travel quickly through the surrounding ground and potentially negatively affect nearby existing structures. Twining has the in-house capability to accurately measure the level of vibrations created during construction using state-of-the-art equipment and software and evaluate the potential effects on surrounding structures.
We typically provide these services in three phases:
- Pre-construction survey
- Field Monitoring during construction
- Post-construction survey and vibration monitoring report
With significant new developments occurring in increasingly condensed spaces, construction-induced vibration damage and its causes are a growing concern. Construction in tight spaces often will result in the need for demolition of existing structures, deep excavations for underground parking, and/or pile foundations that require heavy equipment. Consequently, vibrations induced from the use of heavy equipment such as earthmovers, excavators, drill rigs, and pile drivers will travel quickly through the surrounding ground and potentially negatively affect nearby existing structures. Twining has the in-house capability to accurately measure the level of vibrations created during construction using state-of-the-art equipment and software and evaluate the potential effects on surrounding structures.
We typically provide these services in three phases:
- Pre-construction survey
- Field Monitoring during construction
- Post-construction survey and vibration monitoring report
We Use The Following Techniques
With significant new developments occurring in increasingly condensed spaces, construction-induced vibration damage and its causes are a growing concern. Construction in tight spaces often will result in the need for demolition of existing structures, deep excavations for underground parking, and/or pile foundations that require heavy equipment. Consequently, vibrations induced from the use of heavy equipment such as earthmovers, excavators, drill rigs, and pile drivers will travel quickly through the surrounding ground and potentially negatively affect nearby existing structures. Twining has the in-house capability to accurately measure the level of vibrations created during construction using state-of-the-art equipment and software and evaluate the potential effects on surrounding structures.
We typically provide these services in three phases:
- Pre-construction survey
- Field Monitoring during construction
- Post-construction survey and vibration monitoring report
With significant new developments occurring in increasingly condensed spaces, construction-induced vibration damage and its causes are a growing concern. Construction in tight spaces often will result in the need for demolition of existing structures, deep excavations for underground parking, and/or pile foundations that require heavy equipment. Consequently, vibrations induced from the use of heavy equipment such as earthmovers, excavators, drill rigs, and pile drivers will travel quickly through the surrounding ground and potentially negatively affect nearby existing structures. Twining has the in-house capability to accurately measure the level of vibrations created during construction using state-of-the-art equipment and software and evaluate the potential effects on surrounding structures.
We typically provide these services in three phases:
- Pre-construction survey
- Field Monitoring during construction
- Post-construction survey and vibration monitoring report
Petrographic examination of concrete and cementitious materials (ASTM C856) including visual examination of specimens in as-received condition, stereomicroscopy of polished cross-sectional surfaces, thin section analysis using fluorescence microscopy, and phenolphthalein staining to characterize the composition and condition as well as causes of deterioration or distress in submitted samples,
Scanning electron microscopy with energy dispersive x-ray spectrometry (SEM/EDS) analysis (ASTM C1723) for elemental composition of concrete, cementitious materials, aggregate and secondary deposits,
Chloride analysis to measure acid-soluble chloride content (ASTM C1152) or water-soluble chloride content (ASTM C1218) within a material to evaluate for corrosion potential and external chloride exposure,
Hardened air void system analysis (ASTM C457) to evaluate for total air content and air void system parameters for freeze-thaw durability,
Volumetric proportioning testing (ASTM C457) to quantitatively assess proportioning of concrete in comparison with mix design or specifications,
Bulk resistivity testing (ASTM C1876) to characterize the capillary porosity of concrete mixture(s),
Petrographic examination of aggregates (ASTM C295) to identify potentially deleterious materials with potential for alkali-aggregate reactivity, staining, and/or pop-outs,
and more!
Why Choose Us?
Our laboratory technicians are highly experienced with testing requirements of different pavement preservation materials. Twining laboratories consistently help public works agencies and contractors to test materials such as:
Slurry Seal
Microsurfacing
REAS
Chip Seal
The typical tests that we perform for such materials are:
Wet Track Abrasion
Asphalt content
Emulsion content
Aggregate gradation
Sand Equivalent
Consistency test (field test)
Our Balcony Inspection Services
Twining offers a range of services tailored to meet the unique needs of property owners and managers. Our services include:
E3s Housing Balcony Inspections (CP1481)
We specialize in conducting thorough inspections in compliance with CP1481 requirements, ensuring the safety of residents and compliance with local regulations.
Structural Integrity Assessments
Our team assesses the structural integrity of your balconies, identifying potential issues related to materials, connections, and load-bearing capacity.
Safety Audits
We conduct safety audits to ensure that your balconies meet the highest safety standards, including railings, guardrails, and fire safety measures.
Exterior Elevated Elements (E3s) Housing Balcony Inspection (CP1481)
An Exterior Elevated Elements (E3s) Housing Balcony Inspection (CP1481) is a comprehensive inspection of the balcony structure, including the railings, decking, and supports. The inspection is performed to identify any potential hazards or defects that could compromise the safety of the balcony.
The CP1481 inspection is based on a set of standards developed by the Canadian Construction Association (CCA). The standards cover a wide range of topics, including:
- Design and construction requirements
- Materials and workmanship requirements
- Inspection and testing requirements
We are certified E3s inspector, and we have the experience and expertise to perform comprehensive Balcony Bill Inspections. Our team is well-versed in the local, state, and national building codes, including the requirements outlined in CP1481. We provide a thorough assessment of your balcony's structural integrity, materials, and overall safety, identify potential hazards, and recommend necessary repairs or improvements.
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The best approach to mitigating damage to surrounding structures due to construction-related vibrations is to prevent any possible damage before it occurs. The objective of the pre-construction evaluation is threefold: 1) perform a pre-construction survey of the existing structures of concern to establish baseline damage that has occurred prior to the start of any construction, 2) establish baseline ground motions caused by vehicular traffic (buses, cars, trucks, trolleys and other non-construction vibration sources) near the structures of concern, and 3) perform an evaluation with the proposed equipment on site to establish acceptable means and methods to accomplish the construction tasks. Vibration levels resulting from a range of specific tasks and equipment, including pile driving activities and equipment, can be compared to threshold vibrations with respect to potential damage to structures of concern. This evaluation will establish the means and methods for use during construction that will enable the contractor to stay within the threshold limits.
All aspects of construction, from demolition, installation of drilled and driven piles, deep excavation, and the use of all heavy equipment, will be monitored through this phase. Using state-of-the-art monitoring equipment and software, Twining can provide continuous monitoring of construction activities. A Twining field engineer can observe vibrations in real time and document specific activities that create those vibrations. This information can be used to immediately inform the contractor of approaching threshold vibrations so that corrective measures can be employed. Also, the vibration measurements will be continuously documented to demonstrate the contractor’s adherence to pre-specified vibration threshold limits. Daily reports can be prepared with graphics that illustrate measured vibrations in an easy-to-read, professional format.
At the completion of construction, a Twining registered civil engineer will perform a survey of the structures of concern to document any changes to the existing condition of the structures. The post-construction survey will include a narrative of the survey scope, documentation of the locations of observations as necessary, and photographs of relevant items in the structures. Twining will prepare a final report with engineering review and approval, along with graphics that show the levels of vibrations maintained throughout construction. The final report includes all monitoring data relative to the specific construction activities observed in the field. This report can be used to demonstrate the contractor’s success with respect to adherence to pre-specified vibration limits.
