൱ual must be used in addition to the joint specified ... · 3/4" dia. threaded anchor bolt...
17
൱ual must be used in addition to the joint specified ... · 3/4" dia. threaded anchor bolt or 3/4" dia. variable length allthread with 2" dia. washer locked between 2 nuts . at
See detail of this plate for installation of strapping device as shown where manhole is subject to water velocities. Individual manholes to be strapped and details as to number & location of straps to be shown on plans.
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5. Pioneer 301 Mastic RAM-NEK Preformed Flexible Pioneer 301 Mastic RAM-NEK Preformed Flexible Plastic Gasket or approved equal must be used in addition to the joint specified.
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6. Grout inverts must consist of a Portland Cement Portland Cement concrete mix to VDOT Spec. for Class B-2 or containing 1 part cement, 2 parts mortar sand and 3 1/2 parts aggregate. The surface must be hand troweled smooth with no coarse aggregate exposed and the benches are to have a light broom finish.
8. Pioneer 301 Mastic RAM-NEK Pioneer 301 Mastic RAM-NEK RAM-NEK RAM-NEK Preformed Flexible Plastic Gasket or approved equal must or approved equal must be used in addition to the joint specified. (See Plate 3-10)
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NOTES:
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PRECAST CONCRETE
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CUT-IN MANHOLE
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5-10
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PLATE NO.
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Ref. Sec. 10-0102.5D(7), 10-0105A(8) Rev. X-2020
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1. Contractor must have adequate equipment to pump around existing line while manhole is Contractor must have adequate equipment to pump around existing line while manhole is cut in. 2. Concrete to be Class A-4. Concrete to be Class A-4. 3. All reinforcing steel to meet the current requirements of ASTM Spec. A-614. All reinforcing steel to meet the current requirements of ASTM Spec. A-614. 4. Manhole sections to meet the current requirements of ASTM Spec. C-47B. Manhole sections to meet the current requirements of ASTM Spec. C-47B. 5. Tapered joint with O-Ring Gasket, or single offset joint with rubber gasket, to meet current Tapered joint with O-Ring Gasket, or single offset joint with rubber gasket, to meet current requirements of ASTM Spec. C-443. 6. MH sections to be cast in the base a min. of 2 inch. MH sections to be cast in the base a min. of 2 inch. 7. Joint configuration may be cast bell-up or spitot-up. Joint configuration may be cast bell-up or spitot-up. 8. holes in precast units are to be 4 inch min. 8 inch max. larger than the outside dia. of holes in precast units are to be 4 inch min. 8 inch max. larger than the outside dia. of the proposed pipe. 9. Base section to provide min. 6 inch opening and bottom of bell and spigot joint. Base section to provide min. 6 inch opening and bottom of bell and spigot joint.
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NOT TO SCALE
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Steps to be set in-line
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KOR-N-SEAL or Cast-In-Place
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.
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Water tight coupling or sleve (typ.)
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#57 Stone (typ.)
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NOTES:
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Concrete to be Class A-4.
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All reinforcing steel to meet the
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current requirements of ASTM
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Spec. A-615.
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Manhole sections to meet the
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current requirements of ASTM
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Spec. C-478.
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Tapered joint with O-Ring
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requirements of ASTM Spec. C-443.
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Doghouse opening may only be
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used when placing a new MH
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over an existing line; otherwise,
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the opening must be cast. Size,
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be as required by the plans.
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MH section to be cast in
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the base a min. of 2".
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Joint configuration may be cast
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bell-up or spigot-up.
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Holes in precast units are to be
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4" min. 8" max. larger than
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the outside dia. of the proposed
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pipe.
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Base section to provide min. 6"
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clearance between top of pipe
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opening and bottom of bell and
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spigot joint.
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1.
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2.
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3.
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4.
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5.
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6.
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7.
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8.
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9.
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CHART "A"
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MIN. DIMENSIONS (in.)
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MH
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A
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B
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C
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D
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4'-0"
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48"
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58"
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5"
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6"
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5'-0"
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60"
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72"
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6"
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8"
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72"
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86"
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7"
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10"
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For size of
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Note 8.
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Varies
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(See Note 9)
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A
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B
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C
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D
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4"
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min.
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2"
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min.
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PRECAST CONCRETE MANHOLE
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DOGHOUSE BASE
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DPW-17
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Gasket, or single
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offset joint with rubber gasket, to meet current
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Notch for O-Ring or single
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offset gasket, ASTM C-443
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5-10
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STD. NO.
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PLATE NO.
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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opening see
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Std. precast concrete
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doghouse
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Seal with non-shrink
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grout (Embecco or
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equal).
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Pioneer 301 Mastic
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or approved equal.
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Optional - tapered max. 3" lift
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hole plugged with rubber
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plug. Mortar or mastic
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outside only.
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6'-0"
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Dimensions of D must be taken from bottom of key (see drawing below)
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location & angle of entry must
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Ref. Sec. 10-0102.5D(7) Rev. 1-00, 4-13, 2018 Reprint
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MANHOLE ADJUSTMENT RINGS
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NTS
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7-10
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PLATE NO.
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Ref. Sec. 10-0102.5D(7), 10-0104.2L(11) Rev. x-2020
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34" Manufacturer Seal
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Precast Manhole Cone
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Concrete, Pro Ring or Ladtech adjusting ring or other as approved by the Director
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12" Max. Adjustment
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34" Manufacturer Seal
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Manhole Frame and Cover
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Note: For detail of MH frame and cover anchorage see Plate 10-10.
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Std. MH frame & cover
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Bench
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8" brick
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12" brick
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EXISTING PIPES OF 21" MAXIMUM
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OR BRICK MANHOLE FOR
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TYPICAL ALTERNATE 4'-0" ID BLOCK
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radial block
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9"
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9"
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8"
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Concrete
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4'0" dia.
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3'6"
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3'0"
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2'6"
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2'0"
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to (largest) main sewer line
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Slope Bench 12:1 to 6:1 per ft.
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Steps to be
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6" concrete
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staggered
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of manhole
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PLATE NO.
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7-10
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Invert
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invert exceeds 12', increase
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When top of casting to
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parging
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1/2" Cement
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12" if brick, 8" if block
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thickness of barrel to
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STD. NO.
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more than 6"
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Adjustment ring not
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block
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8"
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2'8"
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12' or less
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DPW-20A
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1/2" Cement
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parging
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Ref. Sec. 10-0102.5D(7) Rev. 1-00, 2018 Reprint
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Projection of the inside crown of incoming sewer must intersect inside crown of main sewer.
Ram-Nek Preformed Flexible Plastic Preformed Flexible Plastic Gasket, Pioneer 301 Mastic or , Pioneer 301 Mastic or or approved equal, must be used except in paved areas as noted in Section 10-0104.2L et seq.
â
â
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Special notes
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TYPICAL 45' ID MANHOLE WITH
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INSIDE DROP CONNECTION
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See Section 10-0102.5E et seq.
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Strap
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Strap
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6"
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STD. NO.
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PLATE NO.
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min.
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dia.
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Grout
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Inside drop connection to be
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used under special
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Slope bench 1" to 2"
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per foot to midpoint
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of pipe
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circumstances such as:
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Ref. Sec. 10-0102.5E Rev. 1-00, 2-07, 2018 Reprint, X-20X-20
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14-10
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Cradle the elbow in bench. The elbow at the bottom of the stack may be either a 45 or 90-degree bend, turned in the direction of flow. Construct channel to conform to the manhole bench.
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Incoming Pipe connection to drop bowl per manufacturer's spec
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Relinerâ or or approved equal inside drop bowl secured with stainless steel fasteners
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External pipe coupler
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Relinerâ or or approved equal force line hood (optional)
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Bad soils/rock, high water table, utility conflicts, excessive depths
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Inside diameter must be at least 5 feet.
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Flexible pipe joint (see Plate 3-10)
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Drop pipe
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DPW-25B
FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
12"
•outside Diameter
nLJ
Backfill and compaction requirements inaccordance with Section 10-0104.2L(13).
Select backfill - hand packed to 95%compaction in accordance with VDOTRoad and Bridee Specs. Sections 528.88,302 and 303;-t&, max granular size 1"
Crushed stone VDOT size 57, 68, or 78 inaccordance with VDOT Road and Bridge Specssection 203 Table 11-5-�
Backfill and compaction requirements inaccordance with Section 10-0104.2L(13)
Crushed stone VDOT size 57, 68, or 78 inaccordance with VDOT Road and Bridee Specssection 203 Table 11-5-�
NOTE 1: The width of the trench is to be as specified by the Engineer on theplans or as set forth in the Specs. Max. trench width and depth must be asspecified in Tables 10.4 and 10.5. Trenching methods must be in compliance withthe Va. Department of Labor and Industry (VOSH) requirements.
NOTE 2: The pipe must be bedded in carefully compacted granular material placedon a fiat trench bottom. The granular material must be crushed stone VDOT size57, 68, or 78, in accordance with VDOT Spec. Section 203. The granular beddingmust have a min. thickness of 1/4 the outside pipe dia. (4" min.) and mustextend vertically in accordance with alternatives A or B. If the max. width of thetrench at the top of the pipe exceeds those specified, granular bedding materialwill be brought to the top of the pipe for the full width of the trench. Theremainder of the side fills and a min. depth of 12" over the top of the pipemust be filled with carefully compacted material. Should the contractor elect touse larger stone to carry the water, the larger stone is to be placed beneath thespecified amount of granular material. The larger stone is not in any way toaffect the amount of granular material to be used.
Ref. Sec. 6-1607.18(2),10-0103.7, Plates 17-10,18-10, 19-10
NOTE 1: The width of the trench is to be as specified by the Engineer on the plans or as set forth in the Specs. Max. trench width and depth must be as specified in Tables 10.4 and 10.5. Trenching methods must be in compliance with the Va. Department of Labor and Industry (VOSH) requirements. NOTE 2: The pipe must be bedded in carefully compacted granular material placed on a flat trench bottom. The granular material must be crushed stone VDOT size 57, 68, or 78, in accordance with VDOT Spec. Section 203. The granular bedding must have a min. thickness of 1/4 the outside pipe dia. (4" min.) and must extend vertically in accordance with alternatives A or B. If the max. width of the trench at the top of the pipe exceeds those specified, granular bedding material will be brought to the top of the pipe for the full width of the trench. The remainder of the side fills and a min. depth of 12" over the top of the pipe must be filled with carefully compacted material. Should the contractor elect to use larger stone to carry the water, the larger stone is to be placed beneath the specified amount of granular material. The larger stone is not in any way to affect the amount of granular material to be used.
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Select backfill - hand packed to 95% compaction in accordance with VDOT Road and Bridge Specs. Sections 523.03, Specs. Sections 523.03, 523.03, 302 and 303.10, max granular size 1".10, max granular size 1", max granular size 1"
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Crushed stone VDOT size 57, 68, or 78 in accordance with VDOT Road and Bridge Specs Road and Bridge Specs Specs section 203 Table II-53533
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Crushed stone VDOT size 57, 68, or 78 in accordance with VDOT Road and Bridge Specs section 203 Table II-53533
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*Outside Diameter
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*Outside Diameter
FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
BeQD•
For details of backfill abovespringline of pipe seeDPW 6, Plates 15-10 and16-10.
. · ,
. ·:
�- .·•·· . · .�. 1
,.
:::·:
:.... �:
"=·.
:..,•w;
�\- \j�1/2 BeOD min.
_: .: .. ·· .. :.
See Note l -----,,;=;;'-',l;fR�\i.,,...,i\...,..,)}.i:::;;)s}:·:::>?};:'.(�;f;Jii't:\� 1/4 &OD (4" min.)
l==I I l==I I l==I I 1==111 illl I 1M!1 I 1M!1 I 1M!1 I 1M!1 I 1!!! 111==1I II 11-��� �1�11�1 -
•outside Diameter In case of blasting overbreak,see Note 2.
Ref. Sec. 10-0103.7
NOTES:
1. The compacted crushed stone is to be as described
in Plates 15-10 and 16-10 of the specs.
2. Blasting overbreak to be removed and replaced with
1. The compacted crushed stone is to be as described The compacted crushed stone is to be as described in Plates 15-10 and 16-10 of the specs. 2. Blasting overbreak to be removed and replaced with Blasting overbreak to be removed and replaced with compacted crushed stone.
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For details of backfill above springline of pipe see DPW-6, Plates 15-10 and 16-10.
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17-10
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*Outside Diameter
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HOUSE SERVICE LATERAL (SPUR)
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Sta. given
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on plans
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NOTE:
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DPW-10
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STD. NO.
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PLATE NO.
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Property line
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D*
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90%%d unless otherwise
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shown on plans
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Concrete cradle
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to joint**
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18" min.
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"T", "Y" or Saddle
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Connection
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FLOW
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Lateral material as specified in
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Section 10-0103.8 or in the
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International Plumbing Code
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Watertight plug
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*Not applicable to Planned Development Districts
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**Hand mixing of concrete cradle allowed per VDOT specifications
Location & elevation of end of lateral must be marked as shown on Plate 19-10.
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Bedding beyond concrete cradle must conform to Note 2 of Plate 16-10.
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For elevations and further details, see Plate 19-10.
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(See Plate 19-10.)
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5" dia. laterals must connect to 8" dia. sewer mains by way of a manufactured "T" or "Y". 6" dia. laterals must connect to collector sewers in sizes from 8" to 15" by way of a manufactured "Y" only with prior approval from the Department of Public Works and Environmental Services. Lateral connections to sewers greater than 15" in diameter must be made at manholes. Approved saddles may be used for 5" dia. connections for 8" dia. rigid pipe sewer mains.
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CONSTRUCTION DETAIL
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HOUSE SERVICE LATERAL
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45
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o
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Angle
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Spring line
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PLATE NO.
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Concrete cradle
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to joint**
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"T", "Y",
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or saddle
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Compacted gravel
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Invert
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elevation
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as shown
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45%%d bend
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NOTES:
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D*
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45%%D bend
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Watertight plug
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*Not applicable to Planned Development Districts
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**Hand mixing of concrete cradle allowed per VDOT specifications
1. Gravel bedding beyond the concrete cradle must Gravel bedding beyond the concrete cradle must conform to Note 2 of Plate 16-10. 2. Lateral pipe material must be as specified in Lateral pipe material must be as specified in Section 10-0103.8 or in the International Plumbing Code. 3. CI Saddles must be GENECO Sealtite Sewer Pipe CI Saddles must be GENECO Sealtite Sewer Pipe s must be GENECO Sealtite Sewer Pipe must be GENECO Sealtite Sewer Pipe GENECO Sealtite Sewer Pipe TM Sealtite Sewer Pipe Saddle as made by Richmond Foundry, Pioneer as made by Richmond Foundry, Pioneer as made by Richmond Foundry, Pioneer Foundry, or approved equal. Saddles must or approved equal. Saddles must Saddles must s must must incorporate an alignment flange that protrudes into the tapping hole and must clamp to the existing main with a stainless steel band and stainless steel fasteners. When connecting to a CIPP-lined sewer main, use LMT saddle or TM saddle or approved equal. 4. A long sweep, 90-degree bend may be used as an A long sweep, 90-degree bend may be used as an alternate to two 45-degree bends.
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Minimum and maximum slope grade must slope grade must grade must grade must be 1.04% and 4.17% respectively for all laterals in accordance with International in accordance with International in accordance with International Building Code requirements..
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Invert of house connection must be at crown of sewer.
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TO AVOID CONFLICTS WITH OTHER UNDERGROUND SERVICE UTILITIES, THE MINIMUM LATERAL EXTENSION DISTANCE (D)* MUST BE:
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HOLE IN PIPE
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Clamp width
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15"
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3"
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Spring line
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HOLE IN PIPE ABOVE SPRING LINE
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Hole in pipe
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(Note 1)
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6"
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Cut away view
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Cut away view
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PLATE NO.
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(or equal)
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repair clamp
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226 Smith-Blair
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(Note 1)
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6"
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STD. NO.
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RG-1
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3" hole - max. allowable
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(Note 1)
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180
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o
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ABOVE SPRINGLINE
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Ref. Sec. 10-0104.7E(1) Rev. 1-00, 2018 Reprint
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20-10
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Note 1: Damage exceeding 3" must be repaired as stated under replacement of pipe - see Section 10-0104.7C et seq. 6"-min. dimension from extremity of damaged area to end of sleeve.
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180
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0
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C
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L
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6"
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(R)
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12"
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(R)
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6"
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HOLE IN PIPE BELOW
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PIPE WITH CRACK OR SHEAR
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STD. NO.
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PLATE NO.
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RG-2
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SPRING LINE
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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STD. NO.
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RG-2
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PLATE NO.
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Hole in pipe
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(Pipe replacement
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required)
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Spring
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line
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Existing pipe
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Existing pipe
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Replacement pipe
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Repair clamp
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226 Repair clamp
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Shear crack
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Repair clamp
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Ref. Sec. 10-0104.7E(3) Rev. 1-00, 2018 Reprint
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Ref. Sec. 10-0104.7E(2) Rev. 1-00, 2018 Reprint
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21-10
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22-10
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CRUSHED SECTION OF PIPE
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AND SLIPPED OR LEAKING
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PLATE NO.
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STD. NO.
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RG-3
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JOINT
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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Hairline
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fracture
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Cut line
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Cut line
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Crushed
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area
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12"
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min.
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Extremity of
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damaged area
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Min. length of section to
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be cut and replaced
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12"
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min.
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(See note 1)
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CRUSHED SECTION OR SECTIONS OF PIPE
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AREA OF CUT
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SLIPPED OR LEAKING JOINTS
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Existing
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pipe
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Replacement pipe
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Repair
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clamp
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Repair
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clamp
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pipe
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Existing
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Min. distance from
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extremity of damaged
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area, which must include
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hairline fractures.
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(Applies to each end of
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damaged area)
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Cuts will be made on a vertical plane with
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an approved cutting tool. After the cut has
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been made, a visual inspection will be made
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to check for hairline fractures on the inside
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of pipe; additional pipe will be cut out if
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this condition is found.
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Note 1 -
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23-10
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Ref. Sec. 10-0104.7E(4), 10-0104.7E(5) Rev. 1-00, 2018 Reprint
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Channel iron
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2" Angle iron
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3" x 1-1/2" x 1/4"
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All tunnel ends to be closed with brick and mortar construction.
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JACKING AND BORING/
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HIGHWAY CROSSING
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in the amount of 1/2 pound per bag of cement.
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to which has been added "Passolite" or fly ash
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One part cement and four parts concrete sand
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1" metal band
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Grout Specifications
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Void filled
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with grout
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Weld
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Steel case
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Undisturbed earth
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Weld at all joints
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iron pipe (DIP)
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welded (AWWA C-200) pipe minimum thickness 3/8".
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pipe AASHTO STD. M36 or black seamless steel
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asphalt, coated corrugated metal culvert
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Casing pipe size varies, 8 gauge galvanized
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PLATE NO.
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STD. NO.
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Voids outside to be grouted
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Proposed sewer ductile
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Casing pipe
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Weld
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sewer
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Sanitary
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DIP
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Void filled with
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grout
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Steel liner plate
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PIPE SIZE
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CASING
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CASING PIPE SIZES
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30
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20
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24
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18
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16
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36
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30
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(INCHES)
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PIPE SIZE
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SEWER MAIN
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10
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14
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12
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8
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24
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24
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22
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MINIMUM
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TUNNEL DETAILS
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Void to be filled with
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grout after carrier pipe is
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in place. Ends to be
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closed with brick masonry.
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DWP-12
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FAIRFAX COUNTY PUBLIC FACILITIES MANUAL
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(INCHES)
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36
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36
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25-10
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Rev. 1-00, 2018 Reprint
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The oak chocks with 1" deep grooves must have dimensions of 4" x 6" x 18" and be placed 6' OC. 1" metal bands are to be bound and bolted in chock grooved areas.
