Retaining Wall and Concrete Slab Replacement at Mansfield Transfer Station
- Geotechnical Analysis:
- Surrounding area is classified as a stratified drift aquifer.
- Soil was assumed to be a gravel sand mix.
- Allowable Bearing Pressure = 9400 psf
- Friction angle of 35 degrees
- Unit Weight of 125 pcf
SPI Engineering
The Team
- Nicholas J. DiGirolamo - Majoring in Civil Engineering at the University of Connecticut. Interned under a project manager at the Whiting-Turner Contracting Company and under a PE at Snyder Civil Engineering. Advanced skills in overall construction project overseeing and logistics.
- Reed Feery - Majoring in Civil Engineering at the University of Connecticut. Interned for Snyder Civil Engineering. Adept in AutoCAD 2011 and Microstation. Has extensive inspection experience on project job sites.
- Kevin Peterson - Majoring in Civil Engineering at the University of Connecticut. Interned for Posillico Inc. While working for the civil department at Posillico, one of the jobs seen first hand was a bridge project, which included the reclamation and relaying of proper subgrade for drainage as well as a retaining wall.
- 221 Warrenville rd. Mansfield, CT.
- Approximately 16 acres.
- Bounded by Mansfield Hollows Wildlife Area.
- Fenton River
- Route 89
- 2 vehicle accessible entrances.
Proposed Retaining Wall Design
- 6th Bay:
- Currently DNE
- Necessary earth removal, grading, and leveling of proposed area.
- New bay will be similar to the format of the existing 5 bays.
- 1512 ft^3 of earth to be removed from proposed area.
- Drainage:
- Pitch after upgrade of retaining wall must still effectively relocate water to the existing catch basin.
- Our design will not affect the topographical integrity of the current drainage plan, so additional drainage is not necessary.
- Existing Guardrail System:
- Deteriorated semi-permanent railing system.
- Did not meet OSHA standards.
- Non-Penetrating Rooftop Guard Rail System:
- Weights at the base of the rail system are used to hold the system in place rather than penetrating fasteners.
- Are not designed to be Temporary, but because they are not directly connected, they can be removed and/or relocated.
- Railings are galvanized to ASTM Standards to avoid rusting in even the harshest weathering.
- Existing Condition
- There is currently no bumper protection on the mafia block retaining wall, which has caused severe dislodging of sections, impact damaging, and frictional damage to the existing wall.
- Canister Bumpers:
- Extruding rubber bumpers will be mounted at contact areas (located in two parallel strips at heights 33% and 67% up the face of the wall) between canisters and retaining wall to prevent wall damage and allow for smooth pick-up and removal of canisters.
- Existing Bay Dimensions:
- 30' x 10'
- Heights vary from ~48" to ~6'
- 5 existing bays
- Dumpsters are 50 yd^3
with a height of 106"
- Existing Under-Bay Slabs:
- Existing deteriorated slabs must be removed and disposed of.
- Remaining earth area will need to be graded and leveled.
Inputs:
- Thickness: 12"
- Concrete: 3 ksi, 150pcf
- Poisson's Ratio: 0.1
- Soil: Sand-Gravel Mix
- Subgrade Modulus: 509 kcf
- Allowable Pressure: 9.4 ksf
- Steel: 60 ksi
- 3 in. of cover
- Minimum Reinforcement Ratio: 0.09%
Will be designed to maintain a maximum weight of 40 tons, applied at 4 total rollers at each corner of the canister.
Cost Estimates
- Minimize costs and maximize material usage.
- Maintain constant and swift contact and communication with the client to ensure complete satisfaction and solve any obstacles that may arise.
- Design a complete retaining wall system, which complies with all CT build codes and standards.
- Offer the client multiple alternatives and options in the design process.
- Design a system that allows client's constituents a safe and user-friendly way to recycle. More Importantly, promoting use of the site in the community at large.