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CD-409 Type III Manhole Base I- r: 5'-8" (MIN.) -I r<1 W f- o Z w w (/) ---.. z ~ "--' 00 I Co L I'" - 'I I__ I I -t__ II II ~ PLAN . ',. : :. ~ 'Q C' '~.~...::. : ':'::\I'~ U-.":~:. .i:f.::j n.i t...... f ....J. :.~ ',( -.:,' '; ."":"-~~"::-"T':-':'J l"'" . ...... ..... ';Q .~; ~~. '.: ~ .:~.,'.~. . 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 'f>:~~ : . .~.. . . 'f'..~{ ( t. ': ..:..~' \ ,'~ '. .. \ ....; . fYI: \. J~. ....; . '~>::'.::. '" 1 ~ .... :.. . ~. ....J>. . 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. 00 I ~ + w 0.... -.;t- a::: w l- I- (/) 0 W Z ~ 0::: W <l:: w .-J (/) I..L. 0 0::: W I- W ~ <l:: CS #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". :\" OLDuS/., 6~<1; 11/ ~~~ ~ 19~~ 2 ~~~ (' ,~ d fJ'FC/?\. ~ \. 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