Early Project News
All nine precast sections of the pedestrian tunnel have been set in place.
Bridge bearings have been set in place at the east and west abutments. The bridge bearings allow for controlled movement of the bridge, caused by thermal expansion or contraction and seismic activity.
Deck grinding has begun. This process is done in order to achieve an acceptable surface finish for waterproofing.
Concrete has been poured in the six caissons for the post and panel wing walls at the northwest and southwest side. Concrete has also been poured in the remaining ten ground improvement piles, which have been drilled into the ground to stabilize the excavated land so that the culvert can be securely placed on top.
The bridge girder/deck slide into the final alignment position began on July 8 and was completed on July 9.
Drilling for six caissons for the northwest and southwest post and panel walls have been complete.
Demolition and removal of all spans of the existing bridge has been completed.
In preparation of the bridge deck slide, horizontal and vertical jacks, shim plates and pull rods were staged on the two abutments and four piers. The horizontal jack is used to push the bridge deck horizontally into its alignment. From there the vertical jack pushes the bridge deck up so that the components that reduce stress and allow for controlled movement of the bridge can be placed between the pier and the bridge deck before final alignment is complete.
June 2016 - Bridge demolition has been completed, which included removal of 8 spans.
Grouting of the camber strip on the precast deck began and was completed through panel 25. The camber strip forms were also caulked from below to seal the forms during grouting operations. Camber strips are used to piece the panels together and are held in place by concrete grouts.
Installation of the soldier piles for the northeast and southeast post and panel wingwalls have been completed. Timber back lagging along the eastern portion of the northeast post and panel wingwall have been installed between the soldier piles.
During the summer outage, crews will work two 12 hour shifts.
The removal of the Overhead Catenary (electric wire) System has begun.
Concrete for the north wing wall was placed along the West Abutment.
Along the northeast wing wall, Shafts 24 through 33 were drilled and caissons were installed. Soldier beams, which are drilled into the ground to help with soil retention, were installed at Shafts 25 through 33. Concrete was placed at Shafts 31 through 33.
43 precast deck panels have been installed on the girders.
Seven precast deck panels have been installed on the girders at the east end of the bridge.
The Geosynthetic Reinforced Soil (GRS) wall has been completed and the drilling rig has been mobilized to the easternmost end of the northeast wing wall. A GRS wall uses layers of geosynthetic reinforcement and compacted granular fill material to build a steep wall relatively quickly.
Holes have been drilled and caissons were installed for shafts adjacent to the east abutment south wing wall. Caissons are large, watertight chambers.
May 2016 - Formwork and reinforcing has been installed for the north wing wall.
Installation of the lateral slide beam onto the stem wall of the East Abutment is complete. The north wing wall has also undergone repairs.
On the West Abutment, the forms from the south wing wall have been removed.
24 girders have been delivered and are now on site. Eight girders were lifted into place and spliced into position onto Pier 1 Cap.
Work platforms were installed onto the caps on Piers 3 and 4.
April 2016 - Installation reinforcing and formwork for the south wing wall along the East Abutment has been completed.
Collars and compression strut for the lateral slide beam has been installed at the Pier 1 Cap.
12 girders are now on site. Pieces of the girder have been spliced together. Splicing together of girders involves attaching the girders together with a metal plate and bolts. The girders have been lifted into place on top of Piers 3 and 4.
Concrete for south wing wall along the East Abutment were put in place. Bulkheads and formwork were removed on the south face.
Temperature monitoring for Pier 1 cap was completed and strands for PT tendons at sleeves 1, 2 and 3 were installed. Additionally the cap formwork was lowered to grade to be disassembled.
The contractor began splicing, or combining, large girders. The girders were laid across the lateral side on Piers 3 and 4. These large girders will slide laterally into place on a slide system.
Along the West Abutment, the contractor has been installing stem wall reinforcing, formwork and bulkheads. A bulkhead is a retaining wall along the abutment.
Setting reinforcing and formwork for the south wing wall has been completed along the East Abutment.
Installation of the lateral slide steel of the Pier 3 cap has been completed.
March 2016 - Pier 3 cap formwork was lowered and removed
Along the East Abutment, reinforcing and forms have been placed and concrete has been poured for the south portion of the stem wall.
At Pier 1, the cap has been raised and secured at the top of the pier columns.
Along the East Abutment, the east face formwork has been installed for the stem wall.
Reinforcing and sleeves for post tensioning have been installed at Pier 2 Cap. Anchor bolt forms and sleeves, cooling tubes, and insulation have also been installed.
February 2016 - Contractors have continued placing reinforcing at the north end of Pier 2 Cap. Sleeves for post tensioning strands have also been set at Pier 2 Cap north end. Sleeves are tubes that hold rebar so the rebar can be pulled after the concrete is set in order to make the concrete stronger and able to hold more weight.
At the East Abutment reinforcing was installed for the stemwall. A stemwall runs either perpendicular or at an angle to the connected to the in order to create an embankment to hold back soil underneath the rail.
At Pier 2 Cap the contractor began installing reinforcing and sleeves for post tensioning. Rebar is placed in the sleeves horizontally. Post tensioning is when the horizontal rebar is pulled after the conrete is cured, or set, to help strengthen the concrete.
At Pier 1 North reinforcing was installed and concrete was poured for 2nd lift column.
At Pier 2 and 3, the contractor continues to install reinforcing steel for cap.
January 2016 - On Pier 4 South, north and west side wall forms to reinforce 2nd column cages were set in place.
Assembly of formwork for pier cap at Pier 2 South began. A pier cap is placed at the top of a pier to help disperse the load placed on the pier.
Footing reinforcing began at the east abutment.
A nail wall has been in the process of being built over the last couple of weeks along the west abutment. Soil nails have been installed for the 6th lift which reaches the bottom of the wall. The purpose of a nail wall is to hold the embankment back and to support the structure on the embankment. Holes are drilled into the side of the soil at a slightly downward angle; rebar is inserted and then surrounded by concrete to reinforce the soil. The wall will be able to support the Leiper-Smedley trail.
December 2015 - Cooling tubes were placed on Pier 1 south’s 1st lift column cage. The cooling tubes are used to monitor the temperature of the concrete as it sets.
At Pier 1 North, contractors placed a footing mudmat to provide extra cover and protection to the footing from the soil below. Contractors also installed three sides of footing formwork and began installing bottom mat footing reinforcing which includes a layer of metal rebar.
Contractors installed 1st lift column forms at Pier 4 South. Along Pier 4 North, timber mats were set down to allow drill rig machinery to travel without disrupting the ground near the pier.
Pier 2 North's second vertical column lifts' reinforcing and remaining formwork was installed.
November 2015 - On Pier 1 North, the contractor installed footing reinforcing on the first column, vertical section cage.
On Pier 2 North the contractor began installing reinforcing for the second, vertical section column.
Pier 3 North and South column forms were set and concrete was poured for the first vertical section. Concrete is poured in vertical sections or lifts in order for the concrete to set correctly. If too much concrete is poured vertically at once, the concrete can separate leaving the top portion weaker.
Cooling tubes and the bottom or first vertical section, column forms are installed on Pier 3 North. Cooling tubes have a thermometer used to monitor the temperature of the concrete when it is poured. A water pumped is attached to the cooling tubes to pump water through the concrete to help keep it cool in order to set properly. If the concrete is too hot while it is setting, that can cause shrinkage and cracking.
Contractors delivered and assembled a crawler crane boom that is capable of lifting and moving the extremely heavy items on site, such as the rebar column cages.
On Pier 2 North, the contractor completed setting the reinforcing for the footing. The remaining formwork as set and the contractor placed concrete for the footing.
October 2015 - The Daily Gazette, Swarthmore College’s student newspaper, recently published an article about Crum Creek -- As Construction Levels Crumhenge, College Plans for Aftermath
September 2015 - Contractors are working on drilling shafts down to bedrock and filling the shafts with concrete to create a stable base for the viaduct’s new piers.
Delaware County Times publishes article about Crum Creek Project website -- SEPTA website offers info on Nether Providence bridge replacement project.
August 2015 - New fencing was installed around trailheads north and south of the Viaduct along the Leiper-Smedley Trail.
A project webcam has been installed adjacent to the western end of the Viaduct near the Leiper-Smedley Trail. The camera will be used to take intermittent photos of on-site activities as construction progresses. Photos will be made able on the project website soon.
July 2015 - Contractors recently completed removal of an 1850s-era stone pier that supported the original timber arch truss rail structure between Towers 1 and 2. Work has begun to remove a second stone pier between Towers 5 and 6.
New fencing has been installed at the entrance to the construction site near Rodgers Lane.
June 2015 - Power poles were installed for power line for the Structural Health Monitor System (SHMS) which is a sensor attached to the viaduct to monitor movement. The contractor activated the system on June 19.
May 2015 - Contractors installed orange fencing along protected tree line at Crum Henge. Additional orange fencing and signage at the trail head was also installed leading to work areas.
Filter socks were installed along Access Road 1 and Access Road 2. Crum Henge stones were removed and placed between the tree along the path and the silt fence.SEPTA Rebuilding for the Future signs were installed which includes information on the project, cost and completion date.
April 2015 - Effective Thursday, April 30, 2015, the portion of trail below the Trestle, just north of the Holly Meadow (Crumhenge) will be closed for the duration of the project. This is being done for public safety, and we are asking for the public's compliance with posted signs.
Fall 2014 - Public meetings held at the Swarthmore Train Station and Wallingford Train Station click here to view the public meeting ad and other materials.