How I spent my Saturday
Actually, we started work on this a couple of weeks ago. We finally got a couple of days break in the weather, and my assistant and I decided to go for it, before the whole damn thing washed down stream.
As part of the school project I am working on we are constructing a box culvert for the entrance road to the school We had to follow all TDEC rules and regulations as this is classified as an "Impaired" blue line stream. It is a two barrel affair, and this was the footing/ slab pour for the first half.
Previously we had excavated down to solid rock and backfilled to sub grade with 3 to 6 inch graded stone.
We could have done this with a smaller crane, but got the 60 ton hydraulic for the same price. Rebar mats were tied outside the pour and placed with the crane on Friday. They weighed about 2 tons each. (#7's on 6" centers X #4's at 1' centers)
The six inch pump was key to keeping the water level down during the prep and pour operations. We also had two 4" pumps and two 3" pumps running in various locations.
60 meter pump was used to keep the main access road to the site open for other trades. After we pumped the box culvert floor we pumped a small wall for the loading dock outside the kitchen for the main school building.
The two dowel lines are for the outside and center wall of the two barrel culvert. Once these walls are poured we will divert the main flow of water between them to construct the other barrel.
Specs called for a 3000 psi mix. We used 4000, hot water and 2% non-chloride accelerator. Pour started about 9 a.m., at 3 p.m. we turned off the pumps and let the water level rise above the slab. Once it reaches equilibrium with the stream on the left, it sits there like a bathtub.
A challenging pour, and one that I am very glad is over. Now that we have something substantial to build from, the rest of the job should be much easier. :clap: