I-25 Trinidad under construction

Progress Photos

March 2010


Cranes set a segment of one of the variable depth girders that will span the BNSF Railroad.		Reinforcing steel in the floor of the variable depth girder segments prior placing concrete.
Delivering concrete to variable concrete girder segments on the SB viaduct.		Workers finishing the new concrete floor in a variable depth girder.
Temporary support bents for the variable depth girders.		Cranes lift girders for the SB Purgatoire River bridge.
Night time girder erection on the SB Purgatoire River bridge.


Abutment construction on the SB Main Street off-ramp.

January 2010


Installation of pre-cast concrete deck panels on the SB I-25 viaduct.		Placement of concrete box girders on the SB I-25 viaduct over Main Street.
Placement of concrete box girders on the SB I-25 viaduct over Main Street.

November 2009


A view of Main Street Abutment 1 showing completed drilled shaft foundations.		Construction work at Main Street Abutment 2 already includes MSE walls.
Construction has begun on Abutment 17 of the SB I-25 viaduct.		Pier 3B construction is underway at University Street while AMTRAK passes through.
Demolition of the last standing portions of the SB I-25 viaduct nears completion.
Erection sequence of the first girders for the southbound portion of the project.



Southbound viaduct demolition over College Street.		Erection of the northbound Commercial Street exit sign.
HMA paving of the northbound Main Street on-ramp.
Placement of reinforcing steel for the southbound viaduct pier.

Removal sequence of the old steel girders from the southbound Purgatoire River bridge.




Demolition sequence of the southbound viaduct bridge piers that once spanned Pine Street.

August 2009 - Begining of Phase II Southbound Construction


Pier construction is well underway between the nearly finished northbound viaduct and the existing southbound viaduct.		A significant portion of the construction for the new southbound viaduct can be completed before demolition of the old southbound viaduct.
Workers assemble reinforcing steel for new pile caps for new southbound viaduct piers.		Forms rise from the ground for the first pier of the new southbound viaduct.
A view looking north at the completed northbound Commercial Street access ramps from the new northbound viaduct.

July 2009


Air testing the post tensioning ducts prior to grouting.		Girder transport through Walsenburg detour.
Girder transport through Walsenburg detour.		Girder erection.
Girder erection.		Girder Delivery at Project.
Bridge expansion device bladder installation.		Clearing and Grubbing at the Southbound Trail Wall location.
Overhead sign corbel bolt and reinforcing steel installation.

May 2009


Girder tops with pre-cast concrete deck panels in between awaiting final deck reinforcing.		Reinforcing steel being delivered by crane to steel placers working on the viaduct deck.
Green corrosion resisting epoxy coated reinforcing steel in place for the deck pour.		A deck finishing machine assures the correct slope and grade as fresh concrete arrives.
Workers rake and vibrate fresh concrete into the reinforcing steel mat to eliminate air pockets.		Finished concrete deck slowly cures as the process continues further down the viaduct.

April 2009


In preparation for girder erection, cranes lift temporary supports, known as stiff backs, into place.		Each of the four girders require a stiff back support to span the splice between segments until the closure pour is completed.
Post-tensioning cable ducts are visible in this view. The post-tensioning cable ducts align with the ducts in the drop-in segment.		Stiff backs, which are formed of structural steel, remain in place until girders are permanently spliced.
Workers prepare to temporarily secure the first drop-in segment as it is lifted into place.		The first drop-in segment straddles the railroad tracks as cranes are attached to each end and prepare to lift it into place.
As seen from one of the stiff backs, the first segment is on its way.		In this view from the ground, two drop-in segments are seen in place and the third is on its way.
A small splice space is formed between girder segments. The space will be closed with the concrete closure pour.		Two cranes are used to lift the drop-in girder segments. View is from the viaduct abutment.
Workers position the powerful jacks that will tension the cables and turn several girder segments into a single girder.		Precise tension is applied to each group of cables at the abutment end. Cables will then be permanently capped.
Closure pours are complete (dark vertical bands) and the girders tensioned. Cranes again prepare to lift stiff backs.		Stiff backs are being removed. The four completed long span bridge girders are ready for roadway decking.

January 2009


The contractor prepares to place concrete paving in the shoulder of I-25		A conveyor delivers fresh concrete to a paving machine which shapes the rough surface
Workers following the paving machine give the shoulder a finished driving surface		After a standard curing period a core is drilled by inspectors to test pavement quality
Inspectors test concrete pavement dowel bar location and verify bar depth		A new wall and riprap (stone) installed at the Commercial St culvert which drains NW Trinidad
The north I-25 abutment formed and ready for steel reinforcing bar placement		The north I-25 abutment with steel reinforcing in place and ready for enclosing formwork
Workers build formwork for a viaduct pier diaphragm		Viaduct pier diaphragm showing reinforcing at the terminus of the post tensioning cables
A center segment for the long variable depth Railroad spans sits on blocks ready for placement		View of the Railroad span awaiting placement of the center segments
Construction continues and portions of the project are beginning to look finished.