Fire Station Floor Lifting
The Job
This fire station floor lifting project is located about an hour east of Richmond, Virginia. The concrete slab on the grade floor inside of a fire station on the North Neck of Virginia settled up to two inches. As part of the investigation into the cause, an engineer discovered voids up to 8″ below the slab and multiple broken sanitary sewer pipes below the floor.
The affected areas needing slab foundation repair included a dayroom, kitchen & meeting hall.
The Challenge
In order to minimize disruption to the fire station’s operations, the proposed repair had to be quick, clean, and minimize uncertainty associated with the plumbing repair slab cuts.
The Solution
CJGeo performed ground improvement grouting of the underlying soils to 5′ below-grade utilizing plural component polyurethane compaction grouting, with CJGrout 35NHV. During the compaction grouting process (sometimes called structural polymer grouting), the CJGrout 35NHV lifted the floor back into place.
Because polyurethane grouts cure very quickly, the floor was repaired the day before the plumbing work was scheduled. This allowed the plumbers a stable work surface and eliminated the risk of stuck saws or sudden collapse of the floor during floor sawing for plumbing access.
Grouting sufficiency was verified by using pre & post-grouting DCP tests.
Speak With An Expert
Facing a similar challenge to this fire station floor lifting project by CJGeo? Give us a shout or shoot us a text. Click the state marker for the location of your project for contact info for the appropriate rep.
PA Turnpike Undersealing
The Job
This PA Turnpike undersealing project is located on the Northeast Extension of the Pennsylvania Turnpike. The Northeast Extension runs from Philadelphia to Scranton. As part of a 24 lane mile mill & pave rehabilitation on the Pennsylvania Turnpike, slab stabilization was required. The Turnpike’s specification for stabilization is either liquid asphalt or polyurethane.
In this work area, the turnpike has two northbound and two southbound lanes. A cast in place barrier wall separates the lanes. The pavement is an approximately nine inch thick rigid concrete with up to eight inches of asphalt overlay. Joint spacing ranges from twenty feet to eighty feet.
The Challenge
In order to keep MOT in place continuously, work had to be done 24 hours per day. Multiple mobilizations were used to work around bridge repairs at three different overpasses in the undersealing work area.
The Solution
CJGeo proposed undersealing with CJGrout 40NHL, a 4.0 lb/cuft free rise polyurethane grout formulated specifically for undersealing thick pavements in transportation environments. 40NHL is hydro insensitive, so performs well in wet environments, as confirmed with NYSDOT GTP-9 testing.
Using a double gang drill and single grout truck, CJGeo crews undersealed up to 1.8 lane miles per shift. Drilling operations happened overnight. Grouting during the day is safest, and allows for easy visualization of the entire zone of influence. By working continuously, the general contractor was able to keep MOT in place continuously, avoiding the cost of setting and pulling MOT each day.
Speak With An Expert
Facing a similar challenge to this PA Turnpike undersealing project? Give us a shout or shoot us a text. Click the state marker for the location of your project for contact info for the appropriate rep.
