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Showing posts from June, 2017

Day 29 - Tying deck steel reinforcement

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Early into the day the contractor works on the deck steel. First by placing chairs and then setting transverse bars. The crane safely lifts the rebar onto the bridge so that the workers can continue to tie the deck. The picture shows a portion of the bridge that is complete. One bar is missing on the left and was later installed. After lunch the crew continued to tie steel. They completed the first half in the morning. The chamfer strips in place denote the edge of the bridge deck. The chamfer strip on the left catches water and prevents it from running down the girders. Concrete cover of 2 inches is maintained to ensure longevity of the bridge. The black marks on the left chamfer is how the contractor counted the bars and positioned them using a tape measure.  Close up of the reinforcement shows a 100% tie ensuring that no steel will move before, and during the pour. The diaphragm and wing wall steel was tied and spacing was checked using a tape measur...

Day 28 - Form work and tying rebar

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The safety railings were installed after the forms were placed on the overhang jacks. This picture shows the contractor tying steel on bent #2 (east side of the bridge). The carpenter works on cutting the chamfer strips and pre-nailing them so they can be quickly installed. The steel reinforcement for the deck is 100% epoxy coated. After the steel was tied for the wing walls and diaphragm the operator cleared dirt away to ensure a clean working area. They are preparing to put on the concrete forms. This picture shows 75 L.F. of silt fence that was installed on the SW corner of the project.  This picture shows silt fence that was installed on both the NW and NE side of the project. After the chamfer strips were installed this picture was taken to show the quality of the craftsmanship. A generator/air compressor was placed on the bridge so that a worker can air blast the surface to remove any debris. The crew works on positioning the oxyacetylene tan...

Day 24 - Form work for bridge

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The contractor started by placing hanging jacks on the side of the girders on the north and south side of the bridge. The NU girders have precast holes in them to allow for the rod from the hanging jack to attach to the bridge. This picture shows the hanging jacks after they were placed on the bridge. This shows the hanging jacks from the bottom of the bridge. They rest on the tension side of the girder. The silt fence was installed on the east end of the project. The contractor began on the form work by laying 2x4s and plywood sheathing. The forms for the diaphragm were cut and put in position.

Day 23 - Setting girders and deck panels

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The girders were hauled in on special articulated trailers that have the ability to turn on the rear. The girders arrived at 7:30 am. At 8:00 am promptly the crew began setting girders. Both cranes picked the girder and together they swung them into position. By 8:30 am all girders had been set. This is the finished product. The crew immediately began to prep the girders for deck panels. They cut foam and checked camber on the bridge using a rod and level. The deck panels arrived and were carefully placed onto the girders in a specific order. Once the deck panels were in place this is the finished product.

Day 22 - Site prep for cranes and girders

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 The excavator operator builds up the dirt next to the road so that it will support the outriggers from the crane. Railroad ties are laid so the outriggers of the cranes load can distribute evenly over a large surface area decreasing the chance of a bearing failure. The foreman and the crew double check the crane charts to ensure that they can safely pick the girders. Once the crane is in position the crew levels the crane by adjusting the outriggers. After both cranes have been prepared this is what the site looked like. The crew placed the neoprene bearing pads and joint filler in position so they would be ready to receive girders.

Day 21 - Rip Rap

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The clearing and grubbing has been completed and the contractor is working on laying the type II rock blanket on the slopes. The abutment has rock pushed up against it. Picture is looking at bent 2.  Current view of bent 1 without any rip rap. The steel reinforcement is extruding out of the abutment for next phase of construction.  A majority of bent 2 has been received rock. The type II was placed on top of geo-fabric. The remaining rock will be placed after the bent is back filled.  This picture of the abutment shows the key and seats for the girders. The concrete is smooth and level. A worker cuts the remaining steel into smaller sections so it can fit inside a dumpster to be hauled away. The operator works on cutting the slope to grade so that rock can be placed.

Day 10 - Work Pads

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The crew attached the concrete bucket to the crane to easily transport the concrete to the other side of the bridge. The general layout of the stream in it's current state. Contractor is working towards installing erosion control. The form work is placed around the piles. The laborer and foreman work on pouring the concrete into the work pad forms. The concrete is optional and paid for at the contractors expense and does not require testing. The concrete after it was finished. The steel reinforcement will and chairs will be placed on this work pad to give a nice surface to work with that is both level and clean. This shows the work pad from roadway elevation.