Our blog "Between the Trees" is here!

Traditionally when it comes to installing sheet piling around a bridge pier or along an embankment we think of steel sheet piling.  Steel sheet piling are the most common, and have been one of the most effective methods of installing a deep foundation.  They have a long history of providing a robust barrier through shaped, interlocking sheets that can last for 75+ years. 

When considering our infrastructure often times our inland waterways are forgotten. What most people may not know is that barge transportation is as important as railways or highways.  Barges are responsible for moving more than 60% of grain exports throughout the United States.  Barge transportation is a very efficient mode of moving bulk materials such as grains, coal, and other commodities.  As stated by the National Waterways Foundation 1,750 short tons of dry cargo fit into one barge which is otherwise 16 rail cars or 70 trucks.   

            Hydrographic surveys are a very effective way to map the bottom of a river, lake, or other water body.  By using some of the latest technologies a 3-dimensional model can be developed to show contours, obstacles, scour areas, and large debris.  Even in the most turbid conditions, a hydrographic survey done correctly can be very effective. 

Our final installment of becoming a tow boat master focuses on the demanding schedule that one will encounter if he or she chooses this path. It is not an easy schedule, but the rewards have drawn many. 

We continue our series on becoming a Master of Towing Vessels by next addressing the duties in which this person is responsible. Our last entry left off with some fun statistics that outlined the enormity of cargo in which an average sized tow can transport. This statistic, supplied by the National Waterways Foundation, stated that an average sized, 15 barge tow can transport as much as 216 rail cars, and 1,050 semi-tractors!  Just one barge alone can carry 58,333 bushels of wheat, enough for 2.5 million loaves of bread!

Have you ever wondered how you can get a job running a tow boat up and down the Mississippi River?  Did you know that there is actually a shortage of river boat pilots? 

Recently Susan Pastor with the U.S. Environmental Protection Agency wrote an article in the Spring 2012 edition of the Fox River Current titled “Latest Technology Guides Hydraulic Dredge”.  The article was about the use of a Real Time Kinematic Global Positioning System (RTK-GPS) to aid the dredge operator in removing contaminated sediments from the Fox River in Green Bay, WI.  In the article she writes about the use of the system and how it improves the accuracy in which a dredge operator can remove targeted sediments to designated depths.  These operators can view their progress in real time using pricey, high accuracy equipment.

Preplaced aggregate concrete (PAC) is not a new concept.  In fact it is a method of concrete placement that has been around since the late 1930’s.  However, it is often overlooked as an option to repair dams and bridge piers.  In fact, it is one of the most effective forms of underwater concrete repair. 

It is inevitable.  Over time a river will dig out the land over which it flows.  That’s why we have valleys, coulees, and scour problems on every structure we place in its path.  As James Eads would mostly likely attest, rivers cannot be fully tamed and scour repair will always be a constant struggle for anything set in their way.  Bridge piers are one of the most vulnerable structures to scour problems.