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I-78 Toll Bridge Rehabilitation and Safety Improvements in Pennsylvania

The project timeline is of the year 2020-2021. The project task was regarding the rehabilitation of the I-78 dual road bridge located in Bethlehem. The i78 Easton Road Bridge Abutment Project was built in 1984 and was installed on the muddy site. This was the reason that made it difficult to clear the boreholes of the installations out. Apart from that, there was a bigger issue of the gap created between the i78 bridge and MSE walls.

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I-78 Toll Bridge Rehabilitation and Safety Improvements in Pennsylvania

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  1. ONE STOP MONITORING SOLUTIONS | HYDROLOGY | GEOTECHNICAL | STRUCTURAL | GEODETIC Over 50 years of Excellence through ingenuity PROJECT DOSSIER I-78 EASTON ROAD BRIDGE ABUTMENT PROJECT PROJECT OVERVIEW I-78 EASTON ROAD BRIDGE ABUTMENT PROJECT Bethlehem PA, USA Pennsylvania Department of Transportation, District 5 American Geotechnical and Environmental Services Inc. (AGES) Project Location The rehabilitation required for the existing I-78 dual road bridge on Interstate Easton road Bethlehem PA. Over the years, project involves works Owner Client 78 over near Duration One year (2020-2021) inspections showed settlement and rotation of the MSE walls, which support the bridge as abutments. Separation between MSE walls and the bridge was observed during recent inspections. The bridge was built in 1984 as a dual three-span continuous composite steel multi-girder bridge. WHY MONITORING? Geotechnical instrumentation and monitoring program was planned for the rehabilitation work, which addressed multiple deficiencies and issues mentioned in the maintenance report. The objective was to investigate the movement pattern for both west and east bound of the bridge abutments. The selected geotechnical instrumentation were used to collect sub-surface deformation data as well as the change in pore water pressures under the bridge abutments. www.encardio.com

  2. MONITORING SOLUTION Rite Geosystems Inc., our USA Company was entrusted to provide complete instrumentation and real time monitoring results for the project. Scope of works include: Supply of geotechnical instruments Installation of geotechnical instruments Automatic monitoring with compact dataloggers Online web-based data management system (WDMS) with pre-set alarms INSTRUMENT USED Used to monitor sub-surface lateral movement i.e. deviation from the vertical in two deformation) Used to monitor deformation (settlement or heave) of the soil/rock layers at various depths within the soil/rock body Used to monitor pore water pressure and groundwater location of interest. vibrating wire piezometer installed to monitor pore water pressure at various depths. Any movement within the soil body has an expression on the groundwater and pore water pressures. Thus this reading was important to correlate and understand data. Automatic compact dataloggers with GSM/GPRS modem to transfer recorded data to a remote server/PC. axis (bi-axial In-place inclinometers sub-surface Multipoint borehole extensometers levels at the Multi-level were Piezometers wireless Datalogger Rite Geosystems Inc. also provided complete online cloud based data management solution. INSTALLATION CHALLENGES The site conditions were unfavorable for a clean installation as the ground where installation was taking place (in boreholes) was quite muddy. In addition, since the installation locations were in close vicinity to a busy major highway, heavy salt settled over the area after snowstorms. Also as the locations were on the shoulder, all the installations required special traffic rated utility vault and ABS boxes to house the dataloggers and interface unit for long term protection and correct readings. www.encardio.com

  3. The biggest challenge at the site was to keep the boreholes open due to caving in of gravel layers. The outer casing had to be kept in-place while the MPBX connecting rods were fixed. The MPBX head assembly was installed in the last, once the rods were in-place and grouted. The piezometers were installed at two levels, using fully-grout method. The boreholes seemed dry at the time of the installation. RESULTS Installation of all the instruments was executed successfully, giving the client necessary information required for smooth progress of the project. The wireless datalogger collected the data from the instruments a required frequency and transferred it to a remote server/PC to be easily accessed by stakeholders. The real-time data from the instruments were continuously accessible to the consultant/contractor at their desk, during works. The data management software had the provision to give alarms by SMS/email in case any data crosses the pre-set review and alert levels. The near real-time data helped in the smooth and cost effective progress of construction screenshot from the online database management system are given below. works. Few Google map view of the I-78 Bridge from our database management system, showing location of installed sensors www.encardio.com

  4. In-place Inclinometer data Multipoint Borehole Extensometer data ENCARDIO-RITE ELECTRONICS PVT. LTD. A-7, Industrial Estate, Talkatora Road Lucknow, UP - 226011, India | P: +91 522 2661039-42 | Email: geotech@encardio.com | www.encardio.com International: UAE | Qatar | Bahrain | Bhutan | Morocco | Europe | UK | USA India: Lucknow | Delhi | Kolkata | Mumbai | Chennai | Bangalore | Hyderabad | J&K www.encardio.com

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