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Home My WebLink AboutCORRESPONDENCE - GENERAL CORRESPONDENCE - FORT COLLINS UTILITIES SPECIFICATIONS MANHOLESFORT COLLINS UTILITIES STANDARD CONSTRUCTION SPECIFICATIONS • JUNE90 SECTION 02605 MANHOLES PART 1 - GENERAL 1.1 DESCRIPTION A. This section concerns sanitary sewer manholes, and includes the acceptable products, materials, and construction practices which may be used in the construction and installation of manholes. B. Manholes shall be furnished with all accessories, including steps, base, cone section and ring & cover. C. Manholes shall be installed wherever there is a change in size, direction, slope, at junctions, at the end of each main, and at intervals of not more than four hundred (400) feet. D. All dead-end manholes, where a future sewer main extension is anticipated, shall have pipe stubbed out of the manhole. I. Main extensions shall extend two feet past the manhole (maximum). • a. Main extensions shall be staked with alignment and grade, past the street pavement. • 2. Main extensions shall be plugged with a water -tight factory made, removable plug capable of withstanding the required pressure test. 1.2 PRODUCT DELIVERY, STORAGE AND HANDLING A. Manholes shall be handled, stored, and protected in such a manner as to prevent damage to materials. B. All joint surfaces shall be free from dirt, oil, and grease at the time of installation. PART 2 - PRODUCTS AND MATERIALS 2.1 PRECAST CONCRETE MANHOLES A. Precast manhole bases, risers and cone sections shall be manufactured in accordance with ASTM C478, and shall be made with Type I/II cement. 1. All cone sections shall be the eccentric type. 02605-1 • 2.4 GROUT A. Grout shall be one of the following: 1. Pre -mixed, non-metallic grout; the acceptable types and manufacturers of which are listed below: a. Master Builders; "Embeco Mortar". b. Sonneborn; "Ferrolith G-D.S. Redi-Mixed". c. Or an approved equal. 2. Job -mixed grout, using the following ratio of ingredients: a. One part Portland Cement; conforming to ASTM C207, Type I/II. b. One part sand; conforming to ASTM CL44. c. One part shrinkage correcting aggregate; the acceptable types and manufacturers of which are listed below: i, Master Builders; "Embeco. Aggregate". • ii. Sonneborn; "Ferrolith G-D.S." iii. Or an approved equal. 2.5 RING AND COVER A. All rings shall be 8-inches in height. B. Acceptable ring and covers are: 1. Neenah, R-1706. 2. Or an approved equal. C. 4-inch rings may be acceptable for street overlays or repaving, with approval of the Engineer. 2.6 STEPS A. All steps, in manholes, shall be made of one of the following materials: 1. Aluminum. 2. Copolymer polypropylene plastic, conforming to ASTM C478 and ASTM C497. • 02605-3 • B. Manhole Construction. 0 1. Standard manholes shall be installed in accordance with Detail Drawing No. 3. 2. Drop manholes shall be installed in accordance with Detail Drawing No. 4. a. Drop manholes are required whenever the difference between invert elevations is two (2) feet or greater. 3. Flat -top manholes shall be installed in accordance with Detail Drawing No. 5. a. Flat -top manholes are required whenever the distance between the finished road surface and a manhole barrel section does not allow room for a cone section. b. Access holes for flat -top manholes shall be offset from center. i. If the distance from the manhole cover to the invert of the sewer main is less than 3 feet, the access hole shall be centered. 4. Manholes shall be constructed at the location and to the elevation indicated on the approved Construction Drawings, or as stated by the Engineer to accommodate field conditions. a. The location of manholes shall be referenced by the Design Engineer, to a minimum of two permanent surface references,,and recorded on the As Constructed Drawings. 5. The manhole shall be set plumb. a. Precast concrete adjustment rings shall be used to bring the ring and cover to grade. i. The total height from the top of the cone section to the finish street grade shall not exceed 16-inches. ii. The adjustment rings shall be flush with the inside of the manhole and grouted. 02605-5 X�. FINISHED GRADE 16' MAX. 28' MAX. "�-- 24' Zx •._. a Lu a .1: MANHOLE RUNGS z 12' O.C. �. i SEE NOTE ";.. 12' ''•�' SLOPE MAX. :r;• 1'/FT. SLOPE 2' MIN. 6' :::?::;:;.;'..`::: 8' MIN. T PRECAST MANHOLE BASE ALTERNATE BASE CONCRETE ADJUSTMENT SHIMS GROUTED INSIDE ASTM C-478 ECCENTRIC CONE PRE -FORMED PLASTIC GASKET ASTM C-478 MANHOLE SECTIONS GROUT BASE TO BARREL SECTION ON INSIDE PRE -FORMED PLASTIC GASKET CAST -IN -PLACE CONCRETE BASE NOTE: MINIMUM INSIDE DIAMETER OF PIPE MANHOLE SHALL BE AS FOLLOWS MIN. MANHOLE PIPE SIZE DIAMETER 15' OR LESS 48' 18' TO 30' 60' OVER 30' 72' POURED INVERT STANDARD MANHOLE APPROVED: DETAIL CITY FORTCOLLINS SEWER DECTAILS UCTION DATE: 6/14/90 3 NSTRWATER UTILITIES Lib N Fa! C•Wm DRAWN 8Y: DR, SC a a e i REMOVABLE EXPANSION PLUG i 7 2' MIN. —HAND—COMPACTED GRANULAR BACKFILL DROP MANHOLE ®CITY OF FORT COLLINS SEWER CONSTRUCTION APPROVED: DETAIL WATER UTILITIES DETAILS DATE: 6/14/90 4 '� Fort �'�0f DRAWN BY: SC, OR FINISHED GRADE 16' MAX. 5' MAX. CONCRETE ADJUSTMENT SHIMS GROUTED INSIDE 28' MAX. FLAT SLAB TOP SECTION IN LIEU :,..;,,: •�'..' OF CONICAL TOP ASTM C-478 :.: PRE —FORMED PLASTIC GASKET MANHOLE RUNGS 12' O.C. AS NEEDED :':': SEE TABLE SLOPE 18' MAX. 2' .•:' :: 1'/FT.':.::..'.'. •':'.'.: GROUT BASE TO CONE ON INSIDE NOTE IF MANHOLE DEPTH IS LESS THAN 3 FEET, TOP SECTION SHALL HAVE A CONCENTRIC OPENING. SLOPE Ir 2' MIN. 1'/FT. { T ASTM C-478 MANHOLE SECTION PRE —FORMED PLASTIC GASKET CAST —IN —PLACE CONCRETE BASE MINIMUM INSIDE DIAMETER OF MANHOLE SHALL BE AS FOLLOWS: MIN. MANHOLE PIPE SIZE DIAMETER 15' OR LESS 48' 18' TO 30' 60' OVER 30' 72' :►. 6 8MIN. .� ...:.;:.. _7 POURED INVERT J PRECAST MANHOLE BASE ALTERNATE BASE FLAT -TOP MANHOLE ®CITYFORTCOLLINSSEWER DETAILS CONSTRUCTION DATE: 6/14/90 5 WATT APPROVED: DETAIL ER UTILITIES(TIES cX. w Port Comm DRAWN BY: SC FORT COLLINS UTILITIES WAREHOUSE STOCKED MANHOLES 0708-0512 BARRELL EXTENSION, 12" X 48", CONCRETE WITH PREFORMED ALUMINIUM OR COPOLYMER POLYPROPYLENE PS-2-PFS STEPS, WITH TWO PRESS SEAL GASKET INSERTS PART #X-41 PLACED 180 DEGREES APART OUTSIDE, SEWER MANHOLE ASTM STD. #C478-88A, AMCOR 0708-0514 BARRELL EXTENSION, 24" X 48", CONCRETE WITH PREFORMED ALUMINIUM OR COPOLYMER POLYPROPYLENE PLASTIC STEPS WITH TWO PRESS SEAL GASKET INSERTS PART #X-41 PLACED 180 DEGREES APART OUTSIDE, SEWER MANHOLE ASTM STD. #C478-88A, AMCOR 0708-0516 BARRELL EXTENSION 36" X 48", CONCRETE WITH PREFORMED ALUMINUM OR COPOLYMER POLYPROPYLENE PS-2 PFS STEPS, WITH TWO PRESS SEAL GASKET INSERTS PART #X-41 PLACED 180 DEGREES APART OUTSIDE, SEWER MANHOLE ASTM STD. #C478-88A, AMCOR 0708-0583 BOTTOM FLAT, 36" X 48", CONCRETE WITH PREFORMED ALUMINUM OR COPOLYMER POLYPROPYLENE PS-2-PFS STEPS, WITH TWO PRESS SEAL GASKET INSERTS PART #X-41 PLACED 180 DEGREES APART OUTSIDE, SEWER MANHOLE ASTM STD. #C478-88A, AMCOR 0708-1141 CONE, 30" X 48", ECCENTRIC CONCRETE WITH PREFORMED ALUMINUM OR COPOLYMER POLYPROPYLENE PS-2-PFS STEPS, WITH TWO PRESS SEAL GASKET INSERTS PART #X-41 PLACED 180 DEGREES APART OUTSIDE, SEWER MANHOLE ASTM STD. #C478-88A, AMCOR 0708-1144 CONE, 36" X 48" X 24" ECCENTRIC, CONCRETE WITH PREFORMED ALUMINUM OR COPOLYMENR POLYPROPYLENE PLASTIC STEPS, WITH TWO PRESS SEAL GASKET INSERTS PART #X-41 PLACED 180 DEGREES APART OUTSIDE, SEWER MANHOLE ASTM STD. #C478-88A, AMCOR 0708-2746 "RUBBERNECK", (MANHOLE GASKET), 1", 6 ROLLS OF 14.5' EACH PER CARTON, HENRY COMPANY "RUB'R-NEK L-T-M" 0708-2752 MANHOLE RING & COVER, 24" DIAMETER X MIN. RING DEPTH OF 8", HEAVY DUTY CAST IRON CONSTRUCTION WITH DRIVE OVER LID OF 169 LBS. MIN. WEIGHT PREFORMED BASES ARE GENERALLY ORDERED DIRECTLY THRU AMCOR.