Post on 02-Jun-2020
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Virginia (VDOT) Drainage Inlets
PCVDOT2019A
Virginia Drainage Inlets
Use
Precast drainage inlets are typically used for storm drain systems in lieu of built in place
inlets.
Sizes
Precast drainage inlets are available in many sizes from small area drains to large inlets or
combination inlet / junction boxes, both in rectangular designs as well as circular structures
with diameters of 36 inch through 144 inch.
Application
Precast drainage inlets may be used for the following:
Yard Inlets
Curb Inlets
Catch Basins
Drop Inlets
Area Drains
Traffic areas
Parking lots
Median inlets
Joints
The following joints may be available for precast drainage inlets:
pre-formed mastic or butyl gasket
Mortar joints
Applicable Specifications
The following specifications apply to Virginia precast drainage inlets:
ASTM C478 / AASHTO M199 - Precast Reinforced Concrete Manhole Sections
ASTM C 913 - Precast Concrete Water and Wastewater Structures
ASTM C990 - Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed
Flexible Joint Sealants
Virginia Department of Transportation standards and specifications
TITLE
09-24-18
DATE
Precast DI-1 & 1A Inlet Square & Round Top
Assembly Diagram
Virginia Drainage Structures
20190102TED03
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
Riser
Intermediate Landing
DI-1
(4'-10" Sq)
DI-1A
(5'-4" Sq)
DI-1
(48"Ø to 144"Ø Round)
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
A A
B B
TITLE
09-12-18
DATE
Precast DI-1 & 1A Inlet Round Top
for 48"Ø to 144"Ø Manholes
Virginia Drainage Structures
20190102TED02
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
Section View A-A
Plan View
(48"Ø)
Isometric View
Plan View
(60"Ø to 144"Ø)
Section View B-B
Isometric View
26"
Opg
26"
Opg
6"
8"
VDOT Std DI-1
Frame & Grate Cast-In
VDOT Std DI-1
Frame & Grate Cast-In
A A
B B
TITLE
09-12-18
DATE
Precast DI-1 & 1A Inlet Square Top
Virginia Drainage Structures
20190102TED01
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) 4'-10" top used for 48"Ø manholes; 5'-4" top used for 48"Ø & 60"Ø manholes.
Section View A-A
Plan View
(4'-10" Sq)
Isometric View
Plan View
(5'-4" Sq)
Section View B-B
Isometric View
4'-10"
4'-10"
26"
Opg
Interlock Groove
for 48"Ø Manhole
6" 6"
26"
Opg
Interlock Groove
for 48"Ø or 60"Ø Manhole
5'-4"
5'-4"
VDOT Std DI-1
Frame & Grate Cast-In
VDOT Std DI-1
Frame & Grate Cast-In
TITLE
10-15-18
DATE
Precast DI-2ABC & DEF Inlet
Assembly Diagram
Virginia Drainage Structures
20190102TED18
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
Riser
Intermediate Landing
DI-2ABC
(Right Throat Shown)
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
DI-2DEF
(Right Throat Shown)
Transition Flattop
Transition Flattop
TITLE
10-15-18
DATE
Precast DI-2ABC & DEF Inlet Round & Box
Assembly Diagram
Virginia Drainage Structures
20190102TED19
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
Riser
Intermediate Landing
DI-2ABC
(Right Throat Shown)
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
DI-2DEF
(Right Throat Shown)
Transition Flattop
Transition Flattop
Inlet Box
Top Slab
Top Slab
Inlet Box
TITLE
09-26-18
DATE
Precast DI-2ABC Inlet Round
Virginia Drainage Structures
20190102TED14
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Manhole sections conform to ASTM C478/ AASHTO M199.
4) Throat opening maybe shifted for right, left, or center Inlets.
5) VDOT standard ST-1 steps provided @ 16"CC, aligned vertically for structures with depth of 4'-0" or greater.
6) Throat Length Varies 2'-2" or 4'-0" to 20'-0" in 2'-0" Increments.
Pipe Openings
As Required
Standard Manhole Base
DI-2ABC Transition Flattop
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
5
8" Ø Dowel Holes
VDOT DI-2
Frame & Grate Cast-In
(Grate Not Shown for Clarity)
3"Ø Weep Hole
Grate Unit for
Round or Box Base
As Required
Keyway
Throat Unit "A" or "B" Nosing
Throat Length Varies 2'-2" or 4'-0" to
20'-0" in 2'-0" Increments.
As Required
TITLE
09-27-18
DATE
Precast DI-2ABC Inlet Box
Virginia Drainage Structures
20190102TED15
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Rectangular sections conform to ASTM C890 and C913.
4) Throat opening maybe shifted for right, left, or center Inlets.
5) VDOT standard ST-1 steps provided @ 16"CC, aligned vertically for structures with depth of 4'-0" or greater.
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
VDOT DI-2
Frame & Grate Cast-In
(Grate Not Shown for Clarity)
Throat Unit "A" or "B" Nosing
Throat Length Varies 2'-2" or 4'-0" to
20'-0" in 2'-0" Increments.
As Required
Keyway
Grate Unit for
Round or Box Base
As Required
5
8" Ø Dowel Holes
DI-2ABC Top Slab
3"Ø Weep Hole
3"Ø Weep Hole
Dowel Holes
DI-2ABC Inlet Box
4
1
2
"
8
'
-
0
"
M
a
x
8
"
7
"
Pipe Openings
As Required
TITLE
09-25-18
DATE
Precast DI-2ABC Throat Unit
Virginia Drainage Structures
20190102TED10
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Throat openings may be shifted for right, left, or center Inlets.
Elevation View
(Right Throat Shown)
Isometric View
("A" Nosing Throat)
Section View
("A" Nosing Throat)
Elevation View
(Right Throat Shown)
Section View
("B" Nosing Throat)
Isometric View
("B" Nosing Throat)
2'-0"
16"
2'-0"
5
1
2
" 1
2
"
Throat Length Varies
2'-2" or 4'-0" to 20'-0" in 2'-0" Increments
26" Opg
6"
8"
45°
5
8" Ø Dowel Holes
6"R
12"
6"
Keyway
Angle Iron
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
2'-0"
2'-0"
16"
8"
5
1
2
"
1
2
"
26" Opg 8"
12"
6"
6"Throat Length Varies
2'-2" or 4'-0" to 20'-0" in 2'-0" Increments
8"
8" 8"
5
8" Ø Dowel Holes
6"R
Keyway
Angle Iron
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
TITLE
09-25-18
DATE
Precast DI-2ABC ("A" Nosing) Throat Unit
Virginia Drainage Structures
20190102TED08
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Throat openings may be shifted for right, left, or center Inlets.
Elevation View
(Right Throat Shown)
Isometric View
Section View
("A" Nosing Throat)
2'-0"
16"
2'-0"
8" 8"
5
1
2
"
1
2
"
Throat Length Varies
2'-2" or 4'-0" to 20'-0" in 2'-0" Increments
26" Opg
6"
8"
45°
5
8" Ø Dowel Holes
6"R
12"
6"
Keyway
Angle Iron
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
TITLE
09-25-18
DATE
Precast DI-2ABC ("B" Nosing) Throat Unit
Virginia Drainage Structures
20190102TED09
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Throat openings may be shifted for right, left, or center Inlets.
Elevation View
(Right Throat Shown)
Isometric View
Section View
("B" Nosing Throat)
2'-0"
16"
2'-0"
8" 8"
5
1
2
"
1
2
"
Throat Length Varies
2'-2" or 4'-0" to 20'-0" in 2'-0" Increments
26" Opg
6"
8"
12"
6"
Angle Iron
5
8" Ø Dowel Holes
6"R
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
Keyway
TITLE
09-26-18
DATE
Precast DI-2ABC Grate Unit for Round Base
Virginia Drainage Structures
20190102TED05
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
Elevation View
Isometric View
Section View
(For "A" Nosing Round Base)
Section View
(For "B" Nosing Round Base)
VDOT DI-2
Frame & Grate Cast-In
2
6
"
O
p
g
22"
12"
1
2
"
18"
18"
2'-2"
7"
3"Ø Weep Hole
20"
7"
18"
2'-2"
10"
1
2
"
16"
3"Ø Weep Hole
3'-6"
8"
26" Opg
TITLE
09-26-18
DATE
Precast DI-2ABC Grate Unit for Box Base
Virginia Drainage Structures
20190102TED04
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
Elevation View
Isometric View
Section View
(For "A" Nosing Box Base)
Section View
(For "B" Nosing Box Base)
3'-6"
8"
17
1
2
"
7"
12"
1
2
"
13
1
2
"
2'-2"
18"
26" Opg
15
1
2
"
7"
18"
2'-2"
10"
1
2
"
11
1
2
"
3"Ø Weep Hole
3"Ø Weep Hole
2
6
"
O
p
g
VDOT DI-2
Frame & Grate Cast-In
TITLE
09-27-18
DATE
Precast DI-2DEF Inlet Round
Virginia Drainage Structures
20190102TED16
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Manhole sections conform to ASTM C478/ AASHTO M199.
4) Throat opening maybe shifted for right, left, or center Inlets.
5) VDOT standard ST-1 steps provided @ 16"CC, aligned vertically for structures with depth of 4'-0" or greater.
6) Throat Length Varies 4'-8" or 6'-0" to 20'-0" in 2'-0" Increments.
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
5
8" Ø Dowel Holes
DI-2DEF Transition Flattop
3"Ø Weep Hole
Pipe Openings
As Required
Standard Manhole Base
(60'' Ø Minimum)
Grate Unit for
Round or Box Base
As Required
Keyway
Throat Unit "A" or "B" Nosing
Throat Length Varies 4'-8" or 6'-0" to
20'-0" in 2'-0" Increments.
As Required
VDOT DI-2
Frame & Grate Cast-In
TITLE
09-27-18
DATE
Precast DI-2DEF Inlet Box
Virginia Drainage Structures
20190102TED17
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Rectangular sections conform to ASTM C890 and C913.
4) Throat opening maybe shifted for right, left, or center Inlets.
5) VDOT standard ST-1 steps provided @ 16"CC, aligned vertically for structures with depth of 4'-0" or greater.
6) Throat Length Varies 4'-8" or 6'-0" to 20'-0" in 2'-0" Increments.
4
1
2
"
8
"
9
"
8
'
-
0
"
M
a
x
3"Ø Weep Hole
5
8" Ø Dowel Holes
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
VDOT DI-2
Frame & Grate Cast-In
Throat Unit "A" or "B" Nosing
Throat Length Varies 4'-8" or 6'-0" to
20'-0" in 2'-0" Increments.
As Required
Keyway
Grate Unit for
Round or Box Base
As Required
DI-2DEF Top Slab
3"Ø Weep Hole
DI-2DEF Inlet Box
Dowel Holes
Pipe Openings
As Required
TITLE
09-25-18
DATE
Precast DI-2DEF Throat Unit
Virginia Drainage Structures
20190102TED13
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Throat openings may be shifted for right, left, or center Inlets.
Elevation View
(Right Throat Shown)
Isometric View
("A" Nosing Throat)
Section View
("A" Nosing Throat)
Elevation View
(Right Throat Shown)
Section View
("B" Nosing Throat)
Isometric View
("B" Nosing Throat)
2'-0"
16"
2'-0"
5
1
2
"
1
2
"
Throat Length Varies
4'-8" or 6'-0" to 20'-0" in 2'-0" Increments
56" Opg
6"
8"
12"
6"
2'-0"
2'-0"
16"
8"
5
1
2
"
1
2
"
56" Opg 8"
12"
6"
6"Throat Length Varies
4'-8" or 6'-0" to 20'-0" in 2'-0" Increments
8"
8" 8"
Angle Iron
Angle Iron
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
6"R
6"R
5
8" Ø Dowel Holes
5
8" Ø Dowel Holes
TITLE
09-25-18
DATE
Precast DI-2DEF ("A" Nosing) Throat Unit
Virginia Drainage Structures
20190102TED11
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Throat openings may be shifted for right, left, or center Inlets.
Elevation View
(Right Throat Shown)
Isometric View
Section View
("A" Nosing Throat)
2'-0"
16"
2'-0"
8" 8"
5
1
2
"
1
2
"
Throat Length Varies
4'-8" or 6'-0" to 20'-0" in 2'-0" Increments
56" Opg
6"
8"
12"
6"
5
8" Ø Dowel Holes
6"R
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
Keyway
Angle Iron
45°
TITLE
09-25-18
DATE
Precast DI-2DEF ("B" Nosing) Throat Unit
Virginia Drainage Structures
20190102TED12
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Throat openings may be shifted for right, left, or center Inlets.
Elevation View
(Right Throat Shown)
Isometric View
Section View
("B" Nosing Throat)
2'-0"
16"
2'-0"
8" 8"
5
1
2
"
1
2
"
Throat Length Varies
4'-8" or 6'-0" to 20'-0" in 2'-0" Increments
56" Opg
6"
8"
12"
6"
Angle Iron
5
8" Ø Dowel Holes
6"R
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
Keyway
TITLE
09-26-18
DATE
Precast DI-2DEF Grate Unit for Round Base
Virginia Drainage Structures
20190102TED07
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
Elevation View
Isometric View
Section View
(For "A" Nosing Round Base)
Section View
(For "B" Nosing Round Base)
VDOT DI-2
Frame & Grates Cast-In
5
6
"
O
p
g
6'-0"
8"
56" Opg
2'-2"
2'-2"
18"
18"
7"
7"
22"
20"
3"Ø Weep Hole
3"Ø Weep Hole
12"
1
2
"
18"
10"
1
2
"
16"
TITLE
09-26-18
DATE
Precast DI-2DEF Grate Unit for Box Base
Virginia Drainage Structures
20190102TED06
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
Elevation View
Isometric View
Section View
(For "A" Nosing Box Base)
Section View
(For "B" Nosing Box Base)
VDOT DI-2
Frame & Grates Cast-In
5
6
"
O
p
g
6'-0"
8"
56" Opg
13
1
2
"
12"
1
2
"
2'-2"
18"
17
1
2
"
7"
3"Ø Weep Hole
3"Ø Weep Hole
10"
1
2
"
11
1
2
"
15
1
2
"
7"
18'
2'-2"
TITLE
10-16-18
DATE
Precast DI-3, 4 Top Unit
Assembly Diagram
Virginia Drainage Structures
20190102TED22
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
Riser
Intermediate Landing
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
DI-3, 4
Flattop 2pc CollarFlattop Collar
Adjustment Ring
Face Block
Throat Section
VDOT Std IC-2
Frame & Cover
TITLE
10-09-18
DATE
Precast DI-3, 4 Throat Section Top Unit
Virginia Drainage Structures
20190102TED21
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Throat Face Block poured as separate piece, contractor to install in field.
4) Opening and weep hole centered or may be shifted for left or right when L is greater than 4'-0".
Elevation View
(Throat Face Block Not Shown for Clarity)
Isometric View
("A" Nosing)
Section View
("A" Nosing-LA)
Plan View
("A" Nosing)
Section View
("B" Nosing-LA)
Elevation View
(Throat Face Block Not Shown for Clarity)
L6" 6"
VDOT Std IC-2
Frame & Cover Cast-In
Angle Iron
Angle Iron
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
5
8" Ø Dowel Holes
for Adjacent Concrete
2'-0"
2'-10"
2'-10"
2'-0"
3'-0"
3'-0"
6"
6"
5
1
2
"
3
1
2
"
Type B Face Block
Type A Face Block
Keyway
Weep Hole Notch
20"x30" or 20"Ø Opening
20"x30" or 20"Ø Opening
1" Interlock Groove
1" Interlock Groove
See Note (4)
6"
6"
TITLE
10-09-18
DATE
Precast DI-3, 4 Throat Face Blocks
(LA & LH)
Virginia Drainage Structures
20190102TED20
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) LA=Legacy Americast forms; LH=Legacy Hanson forms.
Plan View
("A" Nosing-LA Shown)
Section View
("A" Nosing Throat-LA)
Section View
("B" Nosing Throat-LA)
Elevation View
("B" Nosing Throat-LH)
Elevation View
("A" Nosing Throat-LH)
Section View
("A" Nosing Throat-LH)
Section View
("B" Nosing Throat-LH)
Elevation View
("A" Nosing Throat-LA)
Elevation View
("B" Nosing Throat-LA)
L
1
1
2
"
14"
9
1
2
"
6"
2"
6"
13
1
2
"
12"
6"
6
1
2
"
1
2
"
1"
1"
2
1
2
"6"
12"
1"
3
1
2
"
1"
6" 2
1
2
"
TITLE
10-09-18
DATE
Precast Shallow DI-3, 4 Curb Inlet
Virginia Drainage Structures
20190102TED23
Elevation View
("B" Nosing)
Isometric View
("B" Nosing)
Section View
("A" Nosing Top Slab)
Section View
("B" Nosing)
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Rectangular sections conform to ASTM C890 and C913.
4) Throat and gutter pan to be poured in the field by others.
5) VDOT standard ST-1 steps provided @ 16"CC, aligned vertically for structures with
depth of 4'-0" or greater.
6) Extended base provided at manufacturer's option.
7) Non-traffic loading only.
VDOT Std IC-2
Frame & Cover Cast-In
Dimensions
L T
2'-6" to 12'-0" 6" Min
> 12'-0" 8"
L-Varies
2'-6" to 20'-0"
T T
Varies
7'-4" Max
3
4
" Interlock
8"
2"
T
1'-6"
2
1
2
"
See Note(6)
5
8" Ø
Dowel Holes
3"Ø Weep Hole
2
1
2" x 2
1
2" x
1
2" Angle Iron
w/4" x
1
2"Ø Shear Stud 3'-6" CC Max
Galvanized after Welding ASTM A-123
Varies
Varies
2'-0" to 6'-6"
T T
Angle Iron
Angle Iron
3
4
"
Interlock
Pipe Openings
As Required
Top Slab
Base
TITLE
10-16-18
DATE
Precast DI-5 Inlet Top
Assembly Diagram
Virginia Drainage Structures
20190102TED25
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
3) DI-5 top can set directly on 48"Ø or 60"Ø manholes.
Riser
Intermediate Landing
DI-5
(Type A)
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
DI-5
(Type B & E)
5
8" Ø Dowel Holes
for Adjacent Concrete
VDOT Std DI-5
Frame & Grate Cast-In
TITLE
10-10-18
DATE
Precast DI-5 Inlet Tops
Virginia Drainage Structures
20190102TED24
Notes
1) This design is intended for precast
structures produced by CP&P only.
2) Concrete compressive strength
4,000 psi minimum.
3) DI-5 top used for 48"Ø & 60"Ø manholes.
Section View
(Type A)
Plan View
(Type A)
Isometric View
(Type A)
Plan View
(Type B & E)
Section View
(Type B & E)
Isometric View
(Type B & E)
Detail View
(Grate Bar Spacing)
Interlock
Groove
for 48"Ø or
60"Ø Manhole
5'-4"
5'-4"
5'-4"
5'-4"
36"Opg
3'-4"
Grate
Type III
Spacing
Type I
Spacing
3
8
"
2"
1
1
2
"
3"
W4
W3
1"
1"
36"Opg
3'-11"
X
D2
D
D1
Z
W2
W1
3'-4"
Grate
36"Opg
36"Opg
3'-11"
D1
X
D
D2
Z
W1
W2
Interlock
Groove
for 48"Ø or
60"Ø Manhole
Cover Dimensions and Quantities (*=1/2" Tolerance)
PG-2A Type
W1 W2 W3 W4 D* D1 D2 X Z
A1, A2, A3
3'-0
1
2
" 2'-0
3
4
" 2'-0
5
16
" 1'-0
3
8
" 6" 4" 4" 14" 2'-2"
B1, B2, B3,
B4, C1, C2, C3
2'-9" 2'-9" 1'-6
9
16
" 1'-6
9
16
" 8" 4
1
2
" 4
1
2
" 16" 2'-8"
E 2'-3" 2'-3" 1'-8
1
16
" 1'-8
1
16
" 12" 8
7
8
" 8
7
8
" 19" 2'-8"
10" 10"
Grate Not
Shown for Clarity
VDOT Std DI-5
Frame & Grate Cast-In
5
8" Ø Dowel Holes
for Adjacent Concrete
TITLE
10-17-18
DATE
Precast DI-7 Inlet Top
Assembly Diagram
Virginia Drainage Structures
20190102TED27
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
3) DI-7 top can set directly on 48"Ø or 60"Ø manholes.
Riser
Intermediate Landing
DI-7
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
VDOT Std DI-7
Frame & Grate Cast-In
TITLE
10-17-18
DATE
Precast DI-7 Inlet Top
Virginia Drainage Structures
20190102TED26
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Contractor to consult VDOT DI-7 standard for grate details and installation details.
4) Taper to prevent settlement of adjacent cast-in-place concrete.
5) DI-7 top used for 48"Ø & 60"Ø manholes.
Section View
Plan View
Isometric View
5'-8"
5'-4"
5'-8" 5'-4"
36" Opg
36"Opg
8"
2" See Note (4)
2"
10"
Interlock Groove
for 48"Ø or 60"Ø Manhole
VDOT Std DI-7
Frame & Grate Cast-In
TITLE
11-01-18
DATE
Precast DI-10GHI & DI-14ABC Type I & II
Inlet Tops Assembly Diagram
Virginia Drainage Structures
20190528TED01
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
3) DI-5 top can set directly on 48"Ø manholes.
Riser
Intermediate Landing
DI-10GHI & 14ABC
(Type I)
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
VDOT Std DI-2
Frame & Grate Cast-In
Modified as Shown
DI-10GHI & 14ABC
(Type II)
TITLE
10-31-18
DATE
Precast DI-10GHI & DI-14ABC
Type I Inlet Top
Virginia Drainage Structures
20190102TED33
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Barrier, Throat, and nosing (galvanized angle) to be provided by others.
4) Dowel holes provided to prevent settlement of adjacent concrete.
5) "Center" orientation shown for clarity, other orientations as required.
Section View
Plan View
(Grate Removed for Clarity)
Isometric View
4'-10"
4'-10" 26" Opg
16
1
4
"
35" Opg
10"
9"
6" 2'-4"
9
1
2
"
8"
8"
16"
16"
11"
VDOT Std DI-2
Frame & Grate Cast-In
Modified as Shown
TITLE
10-31-18
DATE
Precast DI-10GHI & DI-14ABC
Type II Inlet Top
Virginia Drainage Structures
20190102TED34
Section View
Plan View
(Grate Removed for Clarity)
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Barrier, Throat, and nosing (galvanized angle) to be provided by others.
4) Dowel holes provided to prevent settlement of adjacent concrete.
5) "Center" orientation shown for clarity, other orientations as required.
VDOT Std DI-2
Frame & Grate Cast-In
Modified as Shown
4'-10"
4'-10" 26" Opg
16"
16"
10"
9"
6" 2'-4"
9
1
2
"
8"
15
1
4
"
8"35" Opg
11"
TITLE
10-30-18
DATE
Precast DI-10JKL & DI-14DEF
Type I & III Inlet with Flattop Assembly
Virginia Drainage Structures
20190102TED31
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Manhole sections conform to ASTM C478 & AASHTO M199.
4) Rectangular sections conform to ASTM C890 & C913.
5) Steps may be provided at 16" spacing, aligned vertically.
6) Barrier, Throat, and nosing (galvanized angle) to be provided by others.
Pipe Openings
As Required
3"Ø Weep Hole
DI-10JKL/DI-14DEF Top
VDOT Std DI-10JKL/DI-14DEF
Frame & Grate Cast-In
5
8"Ø Dowel Holes
for Interlock
A
s
R
e
q
u
i
r
e
d
Standard Manhole Base
DI-10JKL/DI-14DEF
Type 1 & III Flattop
DI-10JKL/DI-14DEF Inlet Riser
1"Ø Dowel Holes for Interlock
TITLE
10-29-18
DATE
Precast Flattop for DI-10JKL & DI-14DEF
Type I & III
Virginia Drainage Structures
20190528TED02
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
Section View
Plan View
(Grate Not Shown for Clarity)
Isometric View
DIM 48" ID 60" ID 72" ID 84" ID 96" ID 108" ID 120" ID 126" ID 144" ID
A 58" 72" 86" 100" 114" 128" 140" 147" 168"
B 10" 10" 10" 10" 12" 12" 12" 12" 12"
C 11
1
2
" 10" 10
1
2
" 11" 11
1
2
" 12" 12" 14" 14"
B
C
8
1
2
"
30"Opg
22"Opg
2"
TITLE
10-29-18
DATE
Precast DI-10JKL & DI-14DEF Inlet Top
Virginia Drainage Structures
20190102TED28
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Barrier, Throat, and nosing (galvanized angle) to be provided by others.
4) Dowel holes provided to prevent settlement of adjacent concrete.
Section View
Plan View
(Grate Removed for Clarity)
Isometric View
3'-10"
3'-2"
26"Opg
26"Opg
6"
12"
11"
1
1
2
"
9
1
2
"
12" 14"
VDOT Std DI-10JKL/DI-14DEF
Frame & Grate Cast-In
(4) 1"Ø Dowel Holes
for Interlock
10"
4"
5
8"Ø Dowel Holes
for Interlock
4"
5
1
2
"
5
8"Ø Dowel Holes
for Interlock
TITLE
10-29-18
DATE
Precast DI-10JKL & DI-14DEF
Type I & III Inlet
Virginia Drainage Structures
20190102TED30
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Rectangular sections conform to ASTM C890 & C913.
4) Steps may be provided at 16" spacing, aligned vertically.
5) Barrier, Throat, and nosing (galvanized angle) to be provided by others.
6) Max pipe size = 24"Ø.
VDOT Std DI-10JKL/DI-14DEF
Frame & Grate Cast-In
5
8"Ø Dowel Holes for Interlock
DI-10JKL/DI-14DEF Top
3"Ø Weep Hole
Pipe Openings
As Required (6)
A
s
R
e
q
u
i
r
e
d
A
s
R
e
q
u
i
r
e
d
2
2
"
8
"
Extended Base
Optional
8
"
2
'
-
6
"
1"Ø Dowel Holes for Interlock
TITLE
10-30-18
DATE
Precast DI-10JKL & DI-14DEF
Type II Inlet
Virginia Drainage Structures
20190102TED32
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Rectangular sections conform to ASTM C890 & C913.
4) Steps may be provided at 16" spacing, aligned vertically.
5) Barrier, Throat, and nosing (galvanized angle) to be provided by others.
6) Max pipe size = 24"Ø.
2
'
-
6
"
2
'
-
6
"
7
'
-
0
"
Extended Base
Optional
DI-10JKL/DI-14DEF Top
VDOT Std DI-10JKL/DI-14DEF
Frame & Grate Cast-In
5
8"Ø Dowel Holes for Interlock
1"Ø Dowel Holes for Interlock
3"Ø Weep Hole
Pipe Openings
As Required (6)
8
"
8
"
A
s
R
e
q
u
i
r
e
d
A
s
R
e
q
u
i
r
e
d
SL-1
Intermediate Landing
As Required
3
0
"
x
3
0
"
O
p
g
TITLE
11-14-18
DATE
Precast DI-12 Inlet Assembly Diagram
Virginia Drainage Structures
20190102TED44
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
Riser
Intermediate Landing
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
DI-12
2pc Transition Flattop
Transition Flattop
End Cap
Type I Grate
Type II Grate
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
TITLE
11-07-18
DATE
Precast DI-12 Inlet with Transition Flattop
Virginia Drainage Structures
20190102TED37
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Manhole sections conform to ASTM & AASHTO M199.
4) Steps may be provided at 16" spacing, aligned vertically.
5) Keyway provided to prevent settlement of adjacent concrete.
6) DI-12 inlet not to be utilized in locations normally subject to traffic.
7) Dimensions may vary due to form taper 1".
Type I Grate
Type II Grate
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
Pipe Openings
As Required
3"Ø Weep holes
Standard Manhole Base
DI-12 Transition Flattop
L
e
n
g
t
h
V
a
r
i
e
s
L
=
4
'
-
0
"
t
o
1
4
'
-
0
"
i
n
2
'
-
0
"
I
n
c
r
e
m
e
n
t
s
2
4
"
O
p
g
3
'
-
0
"
6
"
End Cap
(Bolted On)
6
"
6
"
Bolt Sleeves
Keyway3
6
"
O
p
g
1
2
"
6
"
TITLE
11-08-18
DATE
Precast DI-12 Transition Flattop
for 48"Ø-144"Ø
Virginia Drainage Structures
20190528TED03
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
Section View
Isometric View
Plan View
(Grates Not Shown for Clarity)
DIM 48" ID 60" ID 72" ID 84" ID 96" ID 108" ID 120" ID 126" ID 144" ID
A 58" 72" 86" 100" 114" 128" 140" 147" 168"
B 17" 2'-0" 2'-7" 3'-2" 3'-9" 4'-4" 4'-10" 5'-1
1
2
" 6'-0"
D 6" 6" 6" 8" 8" 8" 8" 8" 8"
E 11" 11" 11" 11" 11" 11" 11" 12" 12"
24"Opg7" 7"
2"
A
B
D
E
36"Opg
TITLE
11-07-18
DATE
Precast DI-12 Inlet with 2 Piece Flattop
Virginia Drainage Structures
20190102TED38
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Manhole sections conform to ASTM & AASHTO M199.
4) Steps may be provided at 16" spacing, aligned vertically.
5) Keyway provided to prevent settlement of adjacent concrete.
6) DI-12 inlet not to be utilized in locations normally subject to traffic.
7) Dimensions may vary due to form taper 1".
8) This design to be utilized when structure is too short to use standard Precast DI-12 Transition Flattop.
Type I Grate
Type II Grate
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
DI-12 2 Piece Flattop
Standard Manhole Base
Pipe Openings
As Required
End Cap
(Bolted On)
Bolt Sleeves
3"Ø Weep holes
Keyway
3
6
"
O
p
g
6
"
6
"
6
"
6
"
1
2
"
L
e
n
g
t
h
V
a
r
i
e
s
L
=
4
'
-
0
"
t
o
1
4
'
-
0
"
i
n
2
'
-
0
"
I
n
c
r
e
m
e
n
t
s
DIM 48" ID 60" ID 72" ID 84" ID 96" ID 108" ID 120" ID 126" ID 144" ID
A 10
1
2
" 17
1
2
" 24
1
2
" 2'-7
1
2
" 3'-2
1
2
" 3'-9
1
2
" 4'-3
1
2
" 4'-7" 5'-5
1
2
"
B 6" 8" 8" 8" 8" 8" 10" 10" 10"
D 12" 10" 10" 10" 10" 10" 8" 8" 8"
D
B
A
3
'
-
0
"
2
4
"
O
p
g
TITLE
11-14-18
DATE
Precast DI-12 Shallow Top
Assembly Diagram
Virginia Drainage Structures
20190102TED45
Notes
1) This drawing represents most common stacking orientations, additional stacking options may be available.
2) Manhole components to be per ASTM C478.
3) DI-12 inlet not to be utilized in locations normally subject to traffic.
Riser
Intermediate Landing
DI-12 Shallow Top
L=4 for 48"Ø & 60"Ø MH
Flattop Reducer
Cone Reducer 60'' & 72'' Only
Regular Base
Extended Base
No Base
48''Ø Components
60'', 72'', 84'', 96'', 108", 120", 126", & 144"Ø Components
No Base
Extended Base
Regular Base
Intermediate Landing
Riser
Intermediate Reducer
Landing
DI-12 Shallow Top
L=4, L=6, L=8 for 72"Ø-144"Ø MH
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
Type I Grate
Type II Grate
SECTION AB-AB
SCALE 1 / 30
A
A
B
B
TITLE
11-08-18
DATE
Precast DI-12 Shallow Top L=4'-0"
for 48"Ø & 60"Ø Manhole
Virginia Drainage Structures
20190102TED39
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) DI-12 inlet not to be utilized in locations normally subject to traffic.
4) DI-12 top used for 48"Ø & 60"Ø manholes.
Section View A-A
Isometric View
Section View B-B
Plan View
(Grates Not Shown for Clarity)
5'-8"
6'-4" 6'-0"
5'-4"
2"Taper
2" Taper
1
1
2
" Taper
1
1
2
" Taper
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
Type II Grate
Type I Grate
3'-0"
4"
10"
22"Opg23"
24"Opg
1
1
2
" Taper
2" Taper
5'-0"
48"Opg
46"Opg15"
Interlock groove for
48"Ø or 60"Ø Manhole
TITLE
11-12-18
DATE
Precast DI-12 Shallow Flattop L=4'-0"
for 72"Ø-120"Ø Manhole
Virginia Drainage Structures
20190102TED40
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) DI-12 inlet not to be utilized in locations normally subject to traffic.
Section View
Isometric View
Plan View
(Grates Not Shown for Clarity)
DIM 72" ID 84" ID 96" ID 120" ID
A 86" 100" 114" 140"
B 2'-7" 3'-2" 3'-9" 4'-10"
C 8" 8" 10" 10"
D 9" 10" 11" 12"
E 5" 6" 7" 8"
F 2'-1" 2'-8" 3'-3" 4'-4"
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
Type I Grate
Type II Grate
A
B
C
D
F
E
24"Opg
48"Opg
3'-0"
4'-8"
4"
TITLE
11-13-18
DATE
Precast DI-12 Shallow Flattop L=6'-0"
for 84"Ø-120"Ø Manhole
Virginia Drainage Structures
20190102TED41
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) DI-12 inlet not to be utilized in locations normally subject to traffic.
Section View
Isometric View
Plan View
(Grates Not Shown for Clarity)
DIM 84" ID 96" ID 120" ID
A 100" 114" 140"
B 3'-2" 3'-9" 4'-10"
C 8" 10" 10"
D 10" 11" 12"
E 6" 7" 8"
F 2'-8" 3'-3" 4'-4"
A
B
C
D
F
E
24"Opg
72"Opg
3'-0"
6'-8"
4"
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
Type I Grate
Type II Grate
TITLE
11-13-18
DATE
Precast DI-12 Shallow Flattop L=8'-0"
for 120"Ø Manhole
Virginia Drainage Structures
20190102TED42
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) DI-12 inlet not to be utilized in locations normally subject to traffic.
Section View
Plan View
(Grates Not Shown for Clarity)
Isometric View
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
Type I Grate
Type II Grate
12"
8'-8"
8"
3'-0"4'-4"
96"Opg
24"Opg 4'-10"
140"
4"
16"
TITLE
11-05-18
DATE
Precast DI-12 Inlet Box
Virginia Drainage Structures
20190102TED36
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Steps may be provided at 16" spacing, aligned vertically.
4) Dowel holes provided to prevent settlement of adjacent concrete.
Pipe Openings
As Required
Type II Grate
Type I Grate
VDOT Std DI-12 Type I or Type II
Frame and Grate Cast-In
3"Ø Weep holes
L
e
n
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t
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V
a
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i
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s
L
=
4
'
-
0
"
t
o
1
4
'
-
0
"
i
n
2
'
-
0
"
I
n
c
r
e
m
e
n
t
s
V
a
r
i
e
s
8
'
-
6
"
M
a
x
6
"
2
'
-
0
"
6
"
3
'
-
0
"
TITLE
11-15-18
DATE
Precast DI-13 Shoulder Slot Inlet
Virginia Drainage Structures
20190102TED46
Section View
Plan View
(Top Caps Not Shown for Clarity)
Isometric View
Notes
1) This design is intended for precast structures produced by CP&P only.
2) Concrete compressive strength 4,000 psi minimum.
3) Dowel holes provided to prevent settlement of adjacent concrete.
4) Right configuration shown, left confirguration opposite.
Side View
Type I (10'-0") or Type II (20'-0")
20"
2'-6"
4"
11"
14"
4"4"
1
2"Ø Inserts or
1
2"Ø x 2" x 1
1
2"
Hook Bolts Cast-In fo Top Caps
22" H x 20" W Opg
Top Caps
2ea for Type I
4ea for Type II
6"
5" Tapered Slot
6" Tapered Slot
for Form Removal
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