Drones (UAS) for Bridge Inspections A New Approach

Drones The approach to utilizing Unmanned Aerial Systems (UAS) for bridge inspections in regards to incorporating same into the realm of structural bridge inspections is long overdue and is welcomed due to the system’s ability to access areas of bridge which would normally require the archaic and oft utilized approach of requiring the incorporation of travel lane closures, costly under-bridge access equipment, and the requirements of conducting bridge inspections at night as not to interrupt traffic flow.

State by state departments of transportation are researching the viability of drone inspections on our nations infrastructure.  Using a drone for Bridge inspection services add a valuable resource in the bridge inspectors toolbox.

Whereas, for safety reasons, a UAS (being a machine) will never be incorporated and utilized over live traffic, however, its ability to provide stand-off positioning adjacent and parallel to the bridge structure for deck inspections is unsurpassed.

A UAS can be used quickly and efficiently to conduct a full bridge structure inspection, which in turn, will identity areas which might require a more hands-on and thorough inspection of structural deficiencies revealed.   The cost savings enjoyed by the bridge owner who selects an inspection consultant which utilizes a UAS inspection approach and program, versus the under-bridge equipment method, is practically infinite. 

DETAILED REQUIREMENT FOR DRONE USE IN BRIDGE INSPECTIONS 

The UAS will be fitted with high resolution video cameras which will transmit real-time inspection views and inspection progress, infrared thermography (IR) cameras which reveal delamination locations and perimeters of same in concrete surfaces, and a laser-based measuring device which will denote the width of structural cracks discovered.  All the data will be transmitted, via telemetry; to the ground-based Command Center System which will in turn collect and archive all data received for submittal to, and reviewed by, the bridge owner, which will be used for future comparison and reference.

The above information and data will be incorporated into a final bridge inspection report to be submitted to the bridge owner.  At that time, a meeting between the bridge owner and the inspection will be conducted to discuss findings of the UAS inspection, what these findings mean in relation to the Health Index of the bridge, and then further discuss the need for work order-driven repair approaches and requirements.

This information shall be kept and secured by the UAS inspection consultant at all times, and if required and directed by the bridge owner upon their receipt of all bridge inspection related data, the UAS inspection consultant shall delete all files related to the bridge inspection.    

INCORPORATING UAS INTO BRIDGE INSPECTIONS

The incorporation of UASs into viable bridge inspection

procedures is a long overdue and very welcomed approach, since all of us who have been involved in onsite bridge inspection projects for many years know the inherent dangers required for us to perform our duties in regards to maintaining the trust of the traveling public that the nation’s bridges are safe.  Instead of human inspectors risking life, limb and injury to perform their duties in avenues of active traffic, rappelling structural bridge members, and accessing areas on a bridge by massive manlifts and/or under-bridge machines, we now have what was once considered insurmountable, to now having the option of machines performing these duties in our stead.  One can replace a UAS easily, but a human life is irreplaceable. 

In all likelihood, and until the UAS manufacturers can provide a fool-proof and nearly indestructible machine which will be guaranteed to be free of any and all malfunctions, a UAS will not replace the hands-on inspection requirements related to Fracture Critical members of a bridge nor will a UAS be able to access the tight connections within a through-truss bridge nor a deck-truss bridge, but many areas are now within easy reach by utilizing UASs safely. 

For more expert information on bridge inspections using drones contact info@infrastructurepc.com.

Modern technology and robotics can save billions in infrastructure cost

The world has become a global village because countries are now interconnected, more people are travelling and business is expanding in multiple nations. All of these things are happening at an ever increasing pace and to stay competitive on the world stage today our infrastructure needs to keep up. Without a modern, safe infrastructure our ports will not be able to handle the new deep water cargo ship, goods will not be transported from factories to shipyards in a timely manner and people will be constantly late for work. Today more than ever, growth and development is not possible if the nations infrastructure lags behind.

In the 19th and 20th century, America focused mainly on expanding its transportation network by building roads, bridges and other concerned structures. But the inspection and maintenance of those structures have not kept pace. Many of those structures entered the end of their useful life years ago. Traffic loads are 10 times what they were when some of these structures were built. Because they now support more traffic, the loads place additional wear on them. In addition, due to antiquated inspection methods the corrosion and deterioration has outpaced repairs. Due to this deterioration we need to find alternatives to just replacing or re-building these structures.  There is just not enough money in the system to replace all of the bridges for example that are in a state of disrepair.

How modern technology and robotics can revive the infrastructures?

Use of technology and robotics is a proactive step in the maintenance of our infrastructure. For example, if you know that you are having symptoms of any disease in its initial stage then you can effectively treat the disease and regain your health. Similarly, if we know where deterioration, water intrusion and corrosion  is occurring in a structure we can make the minor repairs to them before they become a threat to the whole structure(Movable Bridge Inspections).

Modern technology plays a major role in inspecting the deterioration and other deformities developing in the structure. It accurately assesses the condition of a structure like bridge, road, dam, tunnel in a non destructive manner. In traditional might I say the current antiquated methods, inspections are performed on selected areas which is known as lot sampling and samples are collected through methods like coring and cutting which is a destructive method. Once you core or cut we are exposing these areas to air and moisture which further causes corrosion. 

The inspection and monitoring process of infrastructure needs to change. With todays modern technology and robotics we have the capability to make our inspection processes more accurate. Modern robotics integrated into the inspection process can not only provide more quantitative data but can prevent lane closures, increase the safety of both the inspectors and the public and more accurately assess the infrastructure they are inspecting.

Modern technology combined with robotics has many advantages over traditional methods of infrastructure inspection and maintenance. Some of the benefits are:

• No more lane closures or temporary closing of the bridge

• Eliminates the need for night time inspections

• Increased safety of public and inspection crew

• Quantitative results instead of subjective results

• Real time data analysis on site

• Data history of structure condition can be stored for later detailed analysis

• Accurate condition assessment of surface, super surface and sub surface layers

• Determine density of concrete cover and location of rebar without damaging the surface 

• Find out minor cracks, voids, water intrusions inside the surface and visualize it through 2D and 3D illustrations

• Reduce labour expenses and saves time

• Collect data from dangerous heights from every angle with the help of robotic equipments

• Thoroughly check each and every component of the structure and find out more minor and major problem areas as  compared to visual inspection

• Helps in recommending and prioritizing the repairing work

Infrastructure Preservation Corporation is determined to provide utmost safety to public and staff during bridge and road inspection and provide accurate condition assessment report to the Department of transportation and bridge owners. Therefore, we use customized and patented products for inspection and monitoring of the infrastructure that we are tasked with inspecting.  We use experienced certified bridge inspectors along with robotics to offer the asset managers a far better deliverable then they have ever received before. For example, we have CableScan® which utilizes robotic technology to gather detailed information of a cable stayed bridge in short time. Similarly, we have additional advance technologies developed in house like PoleScan®, TendonScan®, CrackScan® and others which reduce not only reduce the cost of bridge inspection or inspection of any other structure significantly, but provide the quantitative data the department of transportation needs to allocate assets.

Infrastructure Preservation Corporation will provide a free estimate of our inspection services. If you want to find out more about our services go to https://www.infrastructurepc.com/ or email info@infrastructurepc.com.

Advance Movable Bridge Inspection Technologies for Bridge Preservation and Maintenance

Moveable bridges like drawbridges, swing bridges, etc. have been around for a long time. An early version would be a draw bridge that goes over a moat to protect a castle from invaders.  Over time no matter what the materials all of these bridges need to be inspected.  In the US. The federal government requires that bridges including moveable bridges draw bridges be inspected every two years.

Although, movable bridges are found in many forms and many styles some of which include Drawbridge, Bascule bridge, Folding bridge., Curling bridge., Vertical-lift bridge. Table bridge, Retractable bridge (Thrust bridge), Rolling bascule bridge, etc.. 

Types of movable bridge

* Vertical lifts – the bridge deck is raised to allow passage to any vessel

* Bascules – vehicular deck moved from horizontal position to vertical position or near to vertical position.

* Swings – Bridge deck pivots in the horizontal position creating two channels for vessel passage

* Drawbridge - a bridge, especially one over a castle's moat, that is hinged at one end so that it may be raised to prevent people's crossing or to allow vessels to pass under it.

The dynamic nature of the these bridges and their location near the water bodies especially salt water, make them vulnerable to rusting and other micro damages therefore periodic inspection is very important in their smooth functioning and preservation. The fact that they move also brings to mind the wear and tear imposed by heavy loads ,strained motors, hydraulics and gears.

Movable bridge inspection is of two types: Routine inspection (typically conducted every two years) and in – depth inspection for fracture critical or functionally obsolete bridges (typically conducted every year). “Routine inspections have been conducted the same way for years. As bridges age a manual, visual or subjective inspection is just not adequate to be able to properly assess a bridges current condition or to allocate available assets properly” says Doug Thaler of Infrastructure Preservation Corporation.  “Our company took the current inspection requirements and added modern technology and robotics to create a comprehensive inspection of a drawbridge within the department of transportation’s current budget. Another words within the same budget or for the same price but with much more quantitative data.”

In depth movable bridge inspection is detailed evaluation of the physical and mechanical and structural condition of the movable bridge. Conventional movable bridge inspection  are manual, subjective and sometime involves intrusive and destructive methods to quantify and document the deterioration level. This leaves the bridge in worse shape than it was originally found.

At Infrastructure Preservation Corporation (IPC), we provide the most advanced non destructive and non intrusive technology for thorough condition assessment during routine or in – depth movable bridge inspection. Our advanced but easy to use technology allows the bridge inspector and other staff to evaluate the condition of movable bridge with utmost safety and without disturbing the ongoing traffic on bridge deck. Infrastructure Preservation Corporations, (IPC) structural health monitoring can also tell when something is going wrong before a drawbridge gets stuck and traffic is held up.  By being able to know before a motor goes bad or when hydraulic fluid needs to be replaced it can minimize or eliminate emergency calls and an angry public.

Our movable bridge inspection methods conform to FHWA & AASHTO requirements and uses non invasive technologies and cutting edge technologies to collect accurate data about internal cracks, damage, minor or major deterioration, electrical problems, gear issues. Full mechanical and operational issues as well as structure critical and fracture critical items.

Moreover, data collected during routine inspection helps in detecting early stage deterioration and maintenance issues that can cause a drawbridge or moveable bridge to be stuck in the up position requiring emergency repair. The quantitative data provided by IPC allows the  decision makers to take appropriate actions to properly maintain or repair a drawbridge For more information about our products and services visit www.infrastructurepc.com and contact us for further assistance.