A06_-_Manhole_Detail.pdf

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UNIMPROVED SURFACE I IMPROVED SURFACE

FOR MANHOLE COVER AND ASPHALT

NOTES:

1. WHEN MANHOLES ARE INSTALLED IN UNIMPROVED

AREAS, THE TOP OF THE COVER SHALL BE A MIN.

OF 1 FOOT ABOVE ADJACENT FINISHED GRADE. FRAME SEE SlO W2 CONC.

FINISHED

GRADE

SEE

NOlE 3

(TYP)

LARGER DIA. BARRELS MAY

BE REQ'D.(SEE NOlE 11)

THORO-SEAL OR XYPEX

COATING

POINT INSIDE & OUT WITH 1: 3

MORTAR

ROUND

CORNERS

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CLASS "A" CONC. BASE SEE NOlE 6

2. MIN. OF ONE 3" AND ONE 6" GRADE ADJUSTMENT

RINGS. MAX. HEIGHT OF GRADE ADJUSTMENT SEE RINGS = 20". ALlERNAlELY, CONTRACTOR MAY CAST

NOlE B GRADE ADJUSTMENT RINGS IN PLACE.

3. SET ALL BARREL SECTIONS & TAPER SECTIONS IN

PLASTIC GASKET, RAM-NEK OR APPROVED AL TERNAlE.

TYP JOINT 1-1/2" (3/4 X 2-1/2") RAM-NEK SEAL

(2 SEALS IN HIGH WAlER TABLE AREAS).

4. CONE SECTION (TAPER) MUST BE CONCENTRIC FOR

46" MANHOLE UNLESS OTHERWISE SPECIFIED AND

APPROVED BY THE

5. CONSTRUCT ALL FLOW CHANNELS OF PIPE WHEREVER

POSSIBLE. AFlER LOWER RING SECTION IS SET, BREAK OUT TOP HALF OF PIPE FLUSH WITH INSIDE

FACE OF M.H. WALL AND CONSTRUCT SHELF AND

U-SHAPED CHANNEL MAKE ELEVATION CHANGES

GRADUALLY AND DIRECTIONAL CHANGES WITH SMOOTH

CURVES.

6. POURED-IN-PLACE BASE SHALL BE POURED FULL

THICKNESS TO UNDISTURBED SIDES OF EXCAVATION

OR SHALL BE FORMED. PRECAST BASE TO BE FROM

SEE

NOTE 7

A PRESIDIO TRUST APPROVED SOURCE AND PLACED ON

12" THICK 3/4" DRAIN ROCK SUBBASE INSTALLED

AGAINST UNDISTURBED EARTH.

7. JOINT BETWEEN BASE AND BARREL TO BE SEALED

W/1-1/2" (3/4" X 2-1/2") RAM-NEK SEAL

(2 SEALS IN HIGH WAlER TABLE AREAS), AND PLASlER 6" FILLET, 1:3 MORTAR.

B. CLASS "A" CONC. COLLAR SHALL BE 2" BELOW

FINISHED GRADE.

9. STANDARD MANHOLE BARREL SECTION PER ASTM

C47B.

10. BARREL AND TAPER SECTIONS MAY BE CAST IN

PLACE AS APPROVED BY THE PRESIDIO TRUST.

11. 46" I.D. MANHOLE TO BE USED ONLY FOR SEWER MAINS

LESS THAN 18" DIAMElER AND LESS THAN B FT.

DEEP FROM FINISHED GRADE. 60" I.D. MANHOLES

SHALL BE USED FOR ALL OTHER APPLICATIONS.

12. ALL SECTIONS OF MANHOLE MUST BE OF IDENTICAL

MAKE AND MANUFACTURER.

13. MANHOLE TO BE DEWATERED AND DRY

PRIOR TO INSPECTION.

A FLEXIBLE COUPLING, AS APPROVED

BY THE PRESIDIO TRUST, SHALL BE

INSTALLED IN THE SEWER MAIN WITHIN

12" OF THE BASE OF THE MANHOLE (TYP).

NOT REQUIRED WHEN PRECAST BASES ARE

MANHOLE BASE

MANUF. W/FLEX. CPLGS. ALREADY INSTALLED

CHANNELIZATION PLAN E

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O SAN IT ARY FILE: SEWER.DWG

SEWER MANHOLE STD:

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