Muddy Creek Bridge

Mercer County U.S. Route 136

Bridge replacement project began October 4, 2017.

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U.S. Route 136 Bridge over Muddy Creek

Contractors from Boone Construction Company of Columbia, working with the Missouri Department of Transportation, began replacing the old bridge on Tuesday, Oct. 24, 2017.

Old Bridge versus New Bridge

The old bridge, built in 1929, carries more than 1,000 cars and trucks per day. It's approximately 22 feet wide.

The new bridge will be 32 feet wide with four-foot shoulders.

Detour

Motorists are being directed on a signed detour around the project on Routes 6, 5 and US Route 65.

Schedule

The road closed to all traffic on Oct.  24 and is expected to remain closed through February.

All scheduled work is weather permitting and subject to change.

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This picture shows the demolition of the existing bridge. This process is somewhat long due to ensuring proper clean up of the materials from the old bridge.

MoDOT and our contractors work closely with many departments including the Department of Natural Resources, Department of Conservation, etc. to ensure that any material used in the construction of the old bridge is removed in such a way that it minimizes any hazardous effect to the surrounding environment, flora and fauna.

In this picture, MoDOT's Senior Construction Technician is seen near the center of the photo. He's heading to communicate with Boone Construction’s supervisor to discuss the demolition. In the background you can see the east side end bent being removed.

What's a bent? Here's a definition from our Modot.org website: A rigid frame commonly made of reinforced concrete or steel that supports a vertical load and is placed transverse to the length of a structure. Bents are commonly used to support beams and girders. An end bent is the supporting frame forming part of an abutment. The vertical members of a bent are columns or piles.

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Week of Nov. 13 There will to be four drilled shafts for this bridge. This blueprint shows the plans for one of them. A drilled shaft is a deep foundation that is constructed by placing concrete in a drilled hole. Drilled shafts can be an economical alternative to spread footing or driven pile foundations. These shafts can be drilled into a wide variety of soils and rocks.  

Week of Nov. 13 Hayes Drilling, a subcontractor on the project, is inserting a temporary casing into the excavated drill shaft. The temporary casing is used for stability and to prevent the excavated hole to collapse. Once the permanent casing is placed the temporary casing will be removed.  

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Week of Nov. 13 Hayes Drilling pumping water into their excavated hole to be mixed with the slurry. The slurry is used to maintain stability of the excavation to aid in the drilling process. 

Week of Nov. 13 Hayes Drilling and Boone Construction inserting the permanent casing. This casing is being placed into the excavated hole at a depth of 46’ 3 ¼” into the soil. Then drilled 7’ 1/2'” into the rock. Once the permanent casing is in place the temporary casing will be removed. 

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Week of Nov. 13 Shown are the reinforcing steel cages that will be inserted into the drilled shafts. These are 60’ in length and are inspected before placement. These shafts will be immediately placed after the shaft exaction is inspected and accepted. Once these reinforced steel cages are placed and set the contractor will pour concrete. 

Week of Nov. 27
A worker with Boone Construction company checks the forms on one of the center support structures, or bents, as we noted in the second photo in this series. These forms are used to make a bent cap.

What is a bent cap? A bent cap sits on top of the columns or piles. It stretches across the width of the bridge (across all lanes) and takes the weight (or load) crossing the bridge deck and transfers it to the columns or piles.

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Week of Nov. 27
During construction, most people don't get an up close look and an end bent. An end bent is the supporting frame forming part of an abutment. Bents are commonly used to support beams and girders. In the picture you can see the green reinforcing steel sticking out at the top. This type of steel is green due to an epoxy coating used for corrosion resistance.

Week of Nov. 27
 Here is an inside look at a bent cap. This picture captures how precise each bar is to be spaced to meet specifications for the plans of the bridge. Inspectors check the spacing measurements before the cage is placed. Once it passes inspection, it is then placed and forms are placed on each side, ready for concrete to be poured. 

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Week of Nov. 27
Boone Construction Company crew members are pouring concrete into the bent cap form. A concrete plant nearby delivers concrete to the job site once the workers are ready. The concrete truck fills up the hopper that's shown in the phot between the workers, and a crane swings it to the workers near the cap. A lever opens the bottom of the hopper, releasing the concrete into the cap. 

Week of Nov. 27
 This picture shows the forms removed from the cap, revealing the finished product. The actual size of the cap is 4’6” high and 5’0” wide. It's 31’2” from end to end. The cap was poured above the drilled shafts, connecting the two for stabilization. 

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Week of Dec. 4
One of the bridge girders being delivered to the job site. These girders were fabricated off-site at Coreslab in Marshall, Missouri. Boone Construction Company crews operate two cranes simultaneously to remove the girder off the truck and place it on and between two caps to form the center span. 

Week of Dec. 4
A span is known as the horizontal space between two supports of a structure. The girder is lowered just enough so workers can slightly move the ends to align over the laminated neoprene bearing pad on the caps. These bearing pads compress on vertical load and accommodate horizontal rotation. Once one end of the girder is aligned and set, the other end is slowly lowered and set. 

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Week of Dec. 4
This girder has been set on the North side of the center span, looking towards the East. The distance between the center of intermediate bent 2 and 3 is a total of 87’0”. If you look closely, you can see a slight camber in the center of the girder. A camber is known as a positive, upward deformation built into a beam due to the application of pre-stressing forces. 

Week of Dec. 4
These four set girders are part of the center span. Once Boone Construction Company sets all 12 girders for this bridge, the deck panels will be placed on top. They comprise the deck. There are a total of three different types of deck panels being used on this bridge, for a combined total of 93. 

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