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原文传递 Mat Sinking Unit Marks 74th Year, New ARMOR 1 Due Out In 2024

题名：	Mat Sinking Unit Marks 74th Year, New ARMOR 1 Due Out In 2024
正文语种：	eng
作者：	FRANK MCCORMACK
摘要：	Somewhere south of Vicksburg, Miss., on the Mississippi River, there's a crew numbering more than 275 working to do its part in keeping the river on its current course. Levees, spillways and floodways are in place up and down the river to keep the Mississippi within its current banks, and the Old River Control Structure just upriver from the Red River Landing in Louisiana prevents the stubborn river from taking a westward turn toward the Atchafalaya River. But this mobile crew that conducts revetment operations aboard the Vicksburg Engineer District's Mat Sinking Unit (MSU), which deploys in the low water months, has the equally important task of identifying scour points along the river and armoring the bank with an articulated concrete mattress to stabilize the river bottom and prevent further scouring. The current MSU was first deployed 74 years ago in 1948. The unit consists of a deck barge loaded with concrete "squares" that measure four feet by 25 feet. Four gantry cranes move two squares at a time onto the mat laying barge, where an on-deck crew of about 100 stitches the squares together using copper rods and pneumatic tie tools that resemble jackhammers. As the mat is stitched together, the deck barge and mat-laying barge are winched away from the bank, with the concrete mat gently lowered to the river bottom two rows of squares at a time.
出版年：	2022
期刊名称：	The Waterways Jouranl
卷：	136
期：	23
页码：	6,8