Bridge Contractor Alabama

Alabama has more miles of navigable river than any other state in the country, and a great many more miles of creek that never show up on a navigation chart but still have to be crossed to get home. Foundation Masters designs and builds those crossings: private drives, development entrances, farm and timber access, and the replacement of spans that have quietly stopped being safe.

We are a design build firm, which means the investigation, the drawing and the structure all come out of one shop instead of three. Jeff Earl founded Foundation Masters after two decades in deep foundations, earth retention and structural repair, and a licensed professional engineer seals the plan set before anything gets driven.

Alabama sits inside a Southeast footprint that also covers Florida, Georgia, Mississippi, Tennessee, South Carolina and North Carolina. Everything is indexed on the bridge contractor hub.

The Fall Line Decides What Your Foundation Can Reach

There is a line that runs diagonally across Alabama, roughly through Phenix City, Montgomery and Tuscaloosa, where the hard rock of the interior disappears under the sand and clay of the coastal plain. North of it, a pile is looking for rock and will usually find it. South of it, there is no rock within practical reach and capacity has to be built a completely different way. Everything about how a bridge foundation gets designed here follows from which side of that line the crossing sits on.

Black Belt Clay and Why It Moves Abutments

The Black Belt prairie is some of the most productive farm ground in Alabama and some of the least forgiving ground to put a concentrated load on. The clay there has high plasticity, which in plain terms means it swells when it takes on water and shrinks when it gives it back, and it does that seasonally, year after year.

A bridge abutment founded in that zone does not fail all at once. It heaves in the wet season, settles in the dry one, and after enough cycles the bearing seats are no longer where the drawing put them. You see it as a bump at the approach, then as cracking in the abutment face, then as a deck that no longer sits flat.

The design answer is to get the load below the active zone rather than to make the footing bigger inside it, and to keep water from pooling against the abutment in the first place. That is a soil boring question before it is a structural one, which is why we take borings at the abutment locations on this side of the state rather than working from a regional assumption.

The FM-H20 Fire Truck Rated Bridge

A loaded pumper weighs somewhere north of fifteen tons. The pickup that has been crossing your bridge for years weighs three. Those are not the same question, and on a long private drive in Alabama there is usually no second way in. The FM-H20 is the bridge we build so that the answer is yes before anybody has to ask.

Steel girder, beam plate, abutment and 6×6 rail details from a sealed FM-H20 drawing set. Signed and Sealed

Full detail on the FM-H20 fire truck rated residential bridge page. Starting price is around 3,300 dollars per linear foot.

Foundations: The FM-PP30 Driven Pipe Pile

Four FM-PP30 piles carry each abutment. Three inch schedule 40 pipe, thirty tons apiece, driven with a pneumatic hammer by our own crews. Driven rather than hydraulically pressed matters on a tight bank, because a pressed pile has to react against structure that is not there yet and a driven one does not.

What the pile is hunting for depends entirely on where you are. In the valleys around Birmingham and Gadsden it is driven to refusal on limestone or dolomite, and it often gets there quickly. In the Piedmont it has to get through the saprolite and into sound rock, which is deeper and far less predictable than the surface suggests. Below the Fall Line, through the Black Belt and down to Mobile Bay, there is nothing hard to reach at all, so the pile is driven until it develops capacity in the sand and clay, and that means a substantially longer pile. One system, three different jobs.

This is also where the pipe pile approach earns its place over a drilled shaft on a residential job. The rig is small enough to work on a creek bank, and driving to refusal tells you what you have as you go instead of after the concrete cures.

Solution Features in the Birmingham Valley

The limestone and dolomite under Jefferson and Shelby Counties is soluble, and water has been working on it for a very long time. What that leaves is solution channels, soft seams and occasional open voids underneath ground that reads as perfectly sound from the surface.

A bridge abutment is a heavy load in a small footprint, which is precisely the case a shallow void does not survive. Where the geology says solution activity is likely, we take borings at the abutment locations and design from measured refusal rather than from a regional average. Foundation Masters does sinkhole and void work as a core part of the practice, not as something we take on occasionally, and on an Alabama valley crossing that is the difference between a foundation seated on rock and one seated on the roof of something.

Timber Traffic Is a Different Loading Problem

Roughly two thirds of Alabama is forest, and a lot of private crossings in this state exist so that something heavy can get out of the woods. That changes the design question from what is the heaviest vehicle to how many heavy passes does this deck see in a year.

What We Build in Alabama

Alabama Service Areas

Already have a builder lined up? We will do the investigation, the design and the sealed set and hand it to them.

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