Tag: surveyors

Surveyors William Moylan and Garran Wesseman

JNR_06_26_2015_105114_William and Garron_#2_HDR

 

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In this photo William Moylan is working with Garran Wesseman who is standing on the right hand end of a side girder on Tower Three of the Downtown Span of the Ohio River Bridges Project. This was the first section of the downtown span that was attached to Tower Three and marked another milestone in the construction timeline. After this section was placed all three towers were supporting sections of the new bridge.

The surveyors continuously monitor the placement of the bridge components in order to make sure that the bridge is staying true to the design specifications. Their survey equipment is all electronic and communicates the measurements to the surveyors and engineers in real time so that the decisions they make are accurate.

William Moylan talks with his partner Garren Wesseman as they measure the placement of the side girder and road girders of the downtown span.
William Moylan talks with his partner Garran Wesseman as they measure the placement of the side girder and road girders of the downtown span.

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William Moylan at work.
William Moylan at work.

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Caisson Pick

Lifting the Caisson Into Place
Moving the Caisson Into Place

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Yesterday morning the caisson for the bridge pier, 6R2, was moved into place inside the 12 foot diameter steel casing that will protect the bridge piers from damage once the bridge is finished and the river channel is reopened. The rebar caisson is over 60 feet long and moving it requires excellent coordination between the crane operator and the crew on the ground. The caisson must be precisely placed so that the connections to the next components of the tower can be completed. Not only are there Ironworkers involved but additionally there are Carpenters, Pile Drivers and Surveyors that have specific roles to play when these caissons are positioned. The men in the foreground are surveyors whose role is to make sure that the attachment points are properly aligned by accurately measuring exactly where the caisson is situated in the bore. Once all that is completed the cylinder will be poured full of concrete and the pier will be ready for the next piece to be attached.

This is a three frame bracket set of images shot at -2, 0 and +2 EV. The three images were merged in NIK HDR Efex Pro 2 to create the HDR image. After merging and tonemapping the image was returned to Aperture 3 for final processing.