HomeMy WebLinkAboutCD-408 Type II Manhole Base
PLAN
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PLAN
TYPE II MANHOLE BASE
SCALE: NOT TO SCALE
DATE: SEPTEMBER 13, 2006
DRA WN BY: LDH
V:\CAD\NEW sa~NDARDS
APPROVED:
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PUBLIC WORKS DIRECTOR CD-408
FORM RECESS
FOR MANHOLE
PRECAST MANHOLE SECTION. WHEN THERE IS NOT
SUFFICIENT CLEARANCE BETWEEN THE TOP OF THE
MANHOLE BASE AND FINISH GRADE FOR A PRECAST
SECTION, USE TOP SLAB. SEE NOTE 4
SLOPE TO DRAIN WITH MORTAR
9" WALL THICKNESS (TYP.)
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SEE NOTE 7
+
CONSTRUCTION JOINT
OPTIONAL WHEN
CAST -IN-PLACE PIPE
IS USED
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CLASS 2 CONCRETE
#4 BARS @ 12" O.C. EACH WAY,
EACH FACE 2" CLEAR INSIDE SPACE
BOTTOM SLAB TO BE IN PLACE PRIOR
TO CONSTRUCTION OF PIPE, WHEN
CAST -IN-PLACE PIPE IS USED
SECTION A-A
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PIPE
MORTAR
SECTION B-B
TYPE II MANHOLE BASE
SCALE: NOT TO SCALE
DATE: SEPTEMBER 13, 2006
DRA WN BY: LDH
V:\CAD\NEW STANDARDS
APPROVED:
~.M~SHEET 2 OF J
'PUBLlC ORKS DIRECTOR CD-408
ASPHALT CONCRETE
CONCRETE PAD
4'-6" SQUARE
FRAME AND COVER
SEE NOTE 5
GROUND SURFACE
SEE NOTE 6
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#4 BARS @ 14" O.C.
EACH WAY, 2" CLEAR
PAVEMENT CONDITION NATURAL GROUND CONDITION
USE TOP SLAB:
WHERE THERE IS NOT SUFFICIENT CLEARANCE BETWEEN THE TOP OF THE MANHOLE BASE AND FINISH
GRADE FOR A PRECAST SECTION AND SECTION MANHOLE COVER FRAME.
WHEN PLACING A TYPE A OR TYPE C INLET OPENING ON A TYPE II MANHOLE BASE. THE
OPENING IN THE SLAB SHALL CONFORM TO THE INSIDE DIMENSIONS OF THE INLET TO BE USED.
NOTES:
SECTION C-C
TOP SLAB
1. ALL REINFORCED CONCRETE SHALL BE CLASS 2 (590 LBS PCC PER CUBIC YARD).
2. CONSTRUCTION JOINTS ARE OPTIONAL WHERE SHOWN. OTHER LOCATIONS ARE SUBJECT TO
APPROVAL BY THE PUBLIC WORKS DEPARTMENT. KEY DIMENSIONS ARE 1-1/2" x 3".
3. INLET AND OUTLET PIPES SHALL NOT INTERSECT A MANHOLE BASE THROUGH A CORNER. IF
SKEW ANGLE IS TOO GREAT TO PERMIT THE OPENING TO BE MADE IN A SINGLE WALL, USE A
TYPE III MANHOLE BASE (SEE STANDARD PLAN CD-409).
4. TYPE I MANHOLE BASES (STANDARD PLAN CD-407) ARE FOR USE WITH PIPES TO 24" IN
DIAMETER AND WHERE THERE IS SUFFICIENT COVER TO USE A MINIMUM LENGTH MANHOLE
BARREL, ECCENTRIC CONE, AND COVER FRAME. TYPE II MANHOLE BASES ARE FOR USE WITH
PIPES TO 42" IN DIAMETER. MANHOLE BASES FOR PIPES LARGER THAN 60" IN DIAMETER SHALL
REQUIRE A SPECIAL DESIGN.
5. FOR DETAILS OF MANHOLE FRAME AND COVER, SEE STANDARD PLAN CD-407. ORIENT FRAME
DIRECTL Y ABOVE STEPS.
6. SEE STANDARD PLAN CD-407 FOR STEP DETAILS AND LOCATION.
7. STEPS SHALL BE STEEL REINFORCED POLYPROPYLENE PLASTIC, SANTA ROSA CAST PRODUCTS CO.
DWG. NO. PS2-PF OR EQUIVALENT. STEPS TO BE CAST IN PLACE OR PRESS FITTED INTO
PROVIDED HOLES AS PER MANUFACTURER. INSTALL STEPS WITH LOWEST RUNG 1'-0" ABOVE THE
FLOOR AND HIGHEST RUNG NOT MORE THAN 6" BELOW TOP OF MANHOLE. THE SPACING BETWEEN
STEPS SHALL NOT EXCEED 16" AND SHALL BE UNIFORM THROUGHOUT THE LENGTH OF THE WALL.
PLACE THE STEPS IN THE WALL WITHOUT A PIPE OPENING. NO STEPS REQUIRED WHERE
DISTANCE FROM FLOOR OF MANHOLE TO TOP OF MANHOLE IS LESS THAN 2'-6".
TYPE II MANHOLE BASE
SCALE: NOT TO SCALE
DATE: SEPTEMBER 13, 2006
DRAWN BY: LDH
V:\CAD\NEW STANDARDS
SHEET 3 OF 3
CD-408