Maxon Supplies Barge Mounted Concrete Transportation and Placing Systems for New Harry Nice Bridge

Maxon Agitors and Conveyors on Transport Barges

The two transport barges waiting to get the Maxon 15 yd³ Agitors loaded with concrete.

OVERVIEW

In Spring of 2020, the joint venture of Skanska, Corman Kokosing Construction Company, and McLean Contracting Company (Skanska Corman McLean (SCM) JV) was awarded the $463 million project of replacing the Governor Harry W. Nice Memorial/Senator Thomas “Mac” Middleton Bridge. The bridge was originally built in 1940 and has 2 lanes that carry Route 301 across the Potomac River 1.7 miles, connecting Newburg, MD and Dahlgren, VA.

The new bridge will be constructed alongside the old bridge and consist of 4 lanes of traffic with a bike and pedestrian sidewalk. It will also have a 135 ft clearance to accommodate taller river vessels. The project is estimated to be completed in 2023 and the old bridge will be demolished at that time.

THE EQUIPMENT

The SCM JV teamed up with Maxon Industries to engineer a complete concrete placing system. The system consists of 3 marine barges – 2 transport barges and 1 placing barge.

The Transport Barges each contain:

(6) Maxon 15 yd³ Agitors
(4) Transfer Conveyors

The Placing Barge contains:

(2) Maxon 18yd³ Maxcretes
(1) BSA 2108 Concrete Pump
(1) Tower Mounted MX42 Placing Boom

On Land:

(2) Transfer Conveyors
(1) Central Mix Concrete Batch Plant

Conveyors on land transfer concrete to Agitors on transport barge.

Agitors discharge to transfer conveyors on transport barge.

THE PROCESS

The SCM JV uses a local marina to serve as their work-site where they erected a central mix concrete batch plant. Ready mix trucks are being used to transport concrete on land to two transfer conveyors that extend over the water to the transport barges and discharge into the Maxon Agitors. The transport barges then float out to the placing barge. The concrete is discharged from the Agitors onto the transfer conveyors over to the Maxcretes on the placing barge. The Maxcretes remix and meter an uninterrupted stream of concrete into the BSA pump feeding the placing boom. Each Maxcrete’s capacity is 18 yd³ of concrete allowing for rapid discharge of the Agitors on the transport barge. This speedy process allows the transport barge to return to shore for another load as the next barge lines up to discharge.