HomeMy WebLinkAboutCD-409 Type III Manhole Base
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SEE NOTE 7
PLAN SECTION
TYPE III MANHOLE BASE
SCALE: NOT TO SCALE
DATE: SEPTEMBER 13, 2006
DRA WN BY: LDH
V:\CAD\NEW STANDARDS
APPROVED:
~h~.j.l~1;n) SHEET 1 OF 4
PUBLIC WORKS DIRECTOR CD-409
PLAN SECTION
FORM RECESS FOR
MANHOLE BARREL
#6 BARS @ 12" O.C.
EACH WAY, 2" CLEAR
#6 BARS @ 6" O.C.
EACH WAY, 2" CLEAR
CLASS "3"
CONCRETE
10" WALL
(TYP.)
#4 BARS @ 12" O.C.
EACH WAY, 2" CLEAR
SECTION A-A
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PLAN SECTION
PRECAST MANHOLE SECTION. WHEN
THERE IS NOT SUFFICIENT CLEARANCE
BETWEEN THE TOP OF THE MANHOLE
BASE AND FINISH GRADE FOR A
PRECAST SECTION AND MANHOLE
COVER FRAME, USE A TOP SLAB.
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#4 HOOPS AROUND ALL
INLET AND OUTLET PIPES
TYPE III MANHOLE BASE
SCALE: NOT TO SCALE
DATE: SEPTEMBER 13, 2006
DRAWN BY: LDH
V:\CAD\NEW STANDARDS
SHEET 2 OF 4
CD-409
SPECIAL APPLICATIONS OF TYPE III MANHOLE BASES
WHEN UNUSUAL CIRCUMSTANCES, SUCH AS EXCESSIVE SKEW OR PARALLEL PIPES PREVENT THE USE
OF A NORMAL TYPE III MANHOLE BASE. THE WALLS MAYBE LENGTHENED OR RELOCATED TO
ACCOMMODA TE THE PIPES, PROVIDED THE FOLLOWING CRITERIA ARE MET:
1. THE INSIDE DIMENSIONS OR THE BASE SHALL BE SUCH THAT A 48 INCH DIAMETER
CIRCLE WILL LAY FLAT ON THE FLOOR AS SHOWN.
2. THE MAXIMUM DISTANCE BETWEEN ANY TWO INSIDE CORNERS SHALL BE 10 FEET, AS
SHOWN.
3. REINFORCEMENT AND FLOOR, WALL AND TOP THICKNESS SHALL REMAIN THE SAME AS
FOR A NORMAL TYPE III MANHOLE BASE.
4. NO PIPE SHALL EXCEED 60 INCHES (INSIDE DIAMETER)
IF ANY ONE OF THESE CRITERIA CANNOT BE MET. A SPECIAL DESIGN WILL BE REQUIRED.
FRAME AND COVER
SEE NOTE 5
#4 BARS x 4'-2"
4 TOTAL
CONCRETE PAD
4' -6" SQUARE
ASPHALT CONCRETE
#4 x 11" DOWELS
@ 12" O.C.
#6 BARS @ 6" O.C. EACH WAY 2" CLEAR
#6 BARS @ 12" O.C. EACH WAY 2" CLEAR
2"
~ GROUND SURFACE
SEE NOTE 7
PAVEMENT CONDITION NATURAL GROUND CONDITION
USE TOP SLAB:
1. 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.
2. WHEN PLACING A TYPE A OR TYPE C INLET OPENING ON A TYPE III MANHOLE BASE. THE
OPENING IN THE SLAB SHALL CONFORM TO THE INSIDE DIMENSIONS OF THE INLET TO BE USED.
SECTION C-C
TOP SLAB
TYPE III MANHOLE BASE
SCALE: NOT TO SCALE
DATE: SEPTEMBER 13, 2006
DRAWN BY: LDH
V:\CAD\NEW STANDARDS
APPROVED:
~h~... ~ SHEET J OF 4
PUBLIC ORKS DIRECTOR CD-409
NOTES:
1. ALL REINFORCED CONCRETE SHALL BE CLASS 2 (590 LB. 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.
THE WALL MAYBE LENGTHENED OR RELOCATED AS EXPLAINED IN SPECIAL APPLICATIONS OF
TYPE III MANHOLE BASES ON THIS PLAN.
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".
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TYPE III MANHOLE BASE
SCALE: NOT TO SCALE
DATE: SEPTEMBER 13, 2006
DRAWN BY: LDH
V:\CAD\NEW STANDARDS
~PROVED: . ~
~ SHEET 4 OF 4
PUBLI ' WORKS DIRECT R CD-409