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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

Drainage

6th Bay

  • 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.

*6

5

Guardrail System

  • Existing Guardrail System:
  • Deteriorated semi-permanent railing system.
  • Did not meet OSHA standards.

Proposed Railing System

  • 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.

4

Canister Bumper System

3

  • 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"

2

  • Existing Under-Bay Slabs:
  • Existing deteriorated slabs must be removed and disposed of.
  • Remaining earth area will need to be graded and leveled.

1

Under-Bay Concrete Slabs

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

Goals & Conclusions

  • 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.
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