|What do the precast bridge modules look like?||The Module drawings to the left show the configuration of concrete bridge units.|
|Retainer units are used to raise the elevation of the wing wall to prevent back fill from spilling over the sides.|
|The top module is the same as the intermediate module, except it has a place to secure the bearing plates.|
|Tie back modules A and B have the same dimension as the intermediate module. However, the shape is different than that of the intermediate module.|
|Intermediate module is slightly thinner than the base module.|
|Base module is approximately 1/3 wider than the intermediate module. The width can be increased if the soil is unstable. The base module is pinned deep into the ground to secure it.|
- They reduce the risk of contaminating our waterways due to seepage or accidental spills that sometimes occur with poured-in place concrete.
- They are less expensive than poured-in-place concrete and a bit more costly than wood but will last five times longer.
- They are well suited for remote areas where it is inacessible for concrete trucks or the distance is too great. They are of great advantage for use at the off side of the bridge where access for concrete trucks is impossible. It eliminates the time and cost of transporting concrete from one side of the river or stream to the other.
- They are very fast to install. For example, an eight foot high bridge with fifty feet of span can be put in service in approximately two to five days. This size bridge using poured in place concrete would take about six to eight weeks to complete.
- Your roads are closed for a shorter period of time.
- They can be relocated at a future date.
- These bridges are universal. Snowmobilers have found them to be a great asset. Bridges significantly improve the safety issues.
- Golf courses are another place where precast bridges can be used.
2-3 Days with Excavator...
Pollywog Stream Bridge
Completed Beaver Brook Bridge on ITS 90