Work includes mobilization; 740 EA replace manhole frame/cover; 24 EA replace bolted manhole frame/cover; 577 ea seal frame & grade adjustment (paved); 254 EA seal frame & grade adjustment (non-paved); 5 joints grout manhole wall joints; 429 EA grout pipe
seals, lower 18" of manhole; 224 VF grade adjustment replacement; 5 EA complete manhole replacement; 8 EA install bolts/gaskets for bolt down covers; 2,814 VF apply cementitious coating; 154 VF apply epoxy coating to entire manhole; 106 EA construct new grade adjustment using flattop; 15 VF urethane manhole chimney seal; trench and safety systems.
Thereafter, grouting was done in one day per bore, utilizing the primary (centrally located) grout pipe
and the secondary (near side short pipe).
Once inserted into the well, the bore is grouted up with a bentonite clay slurry and the grout pipe
is removed for reuse on the next well.
These grout pipe
were to be used for foundation grouting should any ground movement be detected by the instrumentation installed.
Once the push is completed, (the casing and grout pipe
completely installed from the entrance shaft to the exit shaft) the grout is pumped through the pipe.
Amazon Channel Rehabilitation 24th Avenue to fairgrounds (50 EA Work Zone Isolation Area; 18 EA Channel Wall Base Surface Repair-SK2, Small; 6 EA Channel Wall Base Surface Repair - SK2, Large; 6 EA Channel Wall Face Repair SK4; 30 FT Epoxy Crack Injection SK5; 3 EA Surface Repair at Pipe Penetration SK6; 1 EA Grouted Joint Repair SK9; 15 EA Cut Pipe Flush with Channel Wall; 33 EA Grout Pipe
Exterior, Small; 5 EA Grout Pipe
Exterior, Medium; 5 EA Grout Pipe
Exterior, Large; 2 EA Grout Pipe
Interior, Large; 153 FT Removal of Pipes; 8 FT 6 PVC Pipe; 10 FT 8 PVC Pipe; 28 FT 10 PVC Pipe; 12 FT 10 Concrete Pipe; 32 FT 12 PVC Pipe; 5 FT 12 Concrete Pipe; 35 FT 15 PVC Pipe; 8 FT 18 Concrete Pipe; 8 FT 24 Concrete Pipe).
The highest pumping pressure recorded was 110 psi, at 20 to 25 cubic yards per hour using several four-inch diameter HDPE grout pipes
spaced in the bore.
This was accomplished with little hazard to personnel by driving sleeve port grout pipes
, instead of drilling them in, and controlling overflow water from the trenches during operation,' says Berry.