6' - 0" x 6' - 0" Airport Manhole

Concrete:
  • 5,000 psi @ 28 days
  • 5% - 8% entrained air
Rebar:
ASTM A-615 grade 60
Available duct entrances:
  • a) Standard KO window
  • b) 4" Ø duct terminator
  • c) Custom configurations and/or locations
Design criteria:
  • a) ASTM C585
  • b) Loading per ASTM C857, including:
  • -Earth cover: Min 1' - 0" Max 10' - 0"
  • -AASHTO aircraft wheel load & applicable impact
  • -Vertical & lateral soil pressures determined using 120 PCF soil density
  • -Ground water at 3' - 0" below grade
  • c) Structural design performed using AASHTO strength design
  • d) Reinforcing cover per ACI 318 and ACI 350/01
Weight:
  • 3' - 0" minimum headroom
  • a) Roof slab: 12,790#
  • b) Base section: 25,590#
  • c) Total manhole: 38,380#
  • d) Min 1' - 0" riser: 3,165#

  • 7' - 0" maximum headroom
  • a) Roof slab: 12,790#
  • b) Base section: 40,370#
  • c) Total manhole: 53,160#
  • d) Max 10' - 0" riser: 22,065#
Item Description Qty
1 4T lifting anchors 8
2 Pulling irons: 1-1/4" Ø steel, hot dipped galvanized 4
3 5" Ø Clear opening for sump 1
4 1" Ø ground rod hole 1
5 Cast-in Neenah R-3498-P2S 1
6 Rebar
7 1" butyl rubber joint sealant 3 rolls
3x6x6 Manhole - Typical Install PDF
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3x6x6 Manhole