Upgrading Sun City Center's sewage infrastructure.
The question has been raised as to what all those trucks are doing that are parked in the middle of our streets near manholes. The answer is that they are involved in a massive relining project of 16.78 miles of the 50+ year old gravity sewer lines in the Sun City Center area. Originally the sewer pipes were terra cotta which was state of the art back then. PVC is the current state of the art. So, an inner lining of PVC is now being applied to the old pipes.
Here are photographs that I've taken over the past couple of years, starting with the initial camera survey of the old terra cotta pipes to check for cracks and leaks, through to the current relining process.
A bladder in placed in the sewer line and inflated to keep the upstream waste out of the work area.
A remote controlled camera equipped with lights is run through the pipe.
The camera looks for problems and also exactly locates the 4" laterals that come from each home into the main sewer pipe.
Because I showed an interest, one of the workman ran the camera down the street so that I could see it move.
The liner is made of a specially formulated PVC which is normally rigid but becomes very pliable when heated with steam.
Then steam is applied to make the liner pliable.
The end of the liner is pulled out of the steam cabinet...
And pulled down through the manhole to the next manhole - typically 400' to 600'
Here's the liner coming out of the next manhole.
The end of the pipe is neatly cut off.
A specially contoured plug is installed in the cutoff end.
Steam is run through the pipe to make it very pliable.
After a half-hour or so, the valves are closed and 105 psi steam pressure is applied which inflates the liner against the old terra cotta.
After the lining cools, it is trimmed down in the manhole.
When the liner inflates against the old pipe, it closes off the 4" laterals coming from each home.
Close-up of the rasp cutter tool.
The final step is to grout between the main pipe and hole that was cut for the lateral.
First a sealing bladder (yellow) is expanded up the lateral of each home.
This is how the grout bladder looks when it is inflated.
This is the view in the main pipe after the grout bladder (yellow) has been inflated up into the lateral,
And this is the finished product of a lateral grouted to the new PVC liner.
A fiberglass liner that is impregnated with a heat set resin is pulled through the pipe.
Over a period of about two hours, the water is circulated and heated to 180 degrees,
Lift station rehab:
In addition to relining the sewer pipes, Hillsborough County is also upgrading a number of lift stations in our area. Overall, there are about 700 lift stations in the County.
Lift stations collect the sewage in large concrete "wells". For the lift station on West Del Webb, there is one concrete well which is 12' in diameter and 35' deep. Within the well are three pumps that take turns pumping the sewage on down to the sewage treatment plant on the west side of Interstate 75. The current repairs are deemed "urgent" because the gases, probably from burritos, have eaten away the concrete and pipes. The new stainless steel pipes and pumps have already been installed. The well is being relined by pressure washing the well walls, applying a sealant, applying 6" of foam and then another layer of sealant. These current repairs to the West Del Webb lift station are costing about $130,000.
This is one of the pumps lifted out for the cleaning.
This is a view down into the well after it has been thoroughly pressure washed in preparation for sealing.
And this is a view down into the well after it was relined.
And when all of the temporary repair work was completed, the original chain-link fence was replaced
Return to Dave Brown's Home Page
Comments about this page and links are welcomed.
Email them to: email@example.com