(A) SCOPE:
Furnish a multi-purpose liner for manhole (sanitary, storm, leachate, retrofit) chimneys installed above flat slab tops/cones to address the following criteria.
1.0 Provide a corrosion resistant barrier to protect precast concrete (brick/masonry etc.) grade rings.
1.1 Create an effective seal between multiples of concrete or ABS grade rings and their contact with flat slab tops/cones to prevent infiltration of surface water into the sewer system.
1.2 Provide both vertical and horizontal adjustment to suit grade and camber.
1.3 The chimney liner shall be resistant to the chemical environment normally found in wastewater transmission systems.
(B) POLYETHYLENE (PE) CHIMNEY ADJUSTMENT LINER:
1.0 The chimney adjustment liner shall be a one-piece rotationally molded polyethylene sleeve with a sealing flange (approx 2”/50mm wide) at right angles to the vertical.
1.1 Adjustment heights shall be variable between 4 inches (100mm) and 18 inches (450mm). To accurately conform to final grade as per drawings or as indicated by the engineer it may be necessary to trim the chimney adjustment liner to the required height.
1.2 Inside diameter of the access opening shall be 24 inches (610mm)
(C) MATERIALS:
1.0 POLYETHYLENE (PE) – Low density polyethylene (LDPE), suitable for potable water tanks, chemical storage tanks, and septic tanks.
1.1 Minimum thickness – 0.2”-0.25” (5mm-6mm)
1.2 Colour – dull mustard/goldenrod
(D) INSTALLATION:
1.0 Assemble and install the precast concrete manhole structure in the customary manner as prescribed by the manufacturer and the approved construction plans.
1.1 Inspect precast concrete flat slab top/cone for correct access opening diameter and any damage or irregularities which could compromise the installation and seal of the chimney adjustment liner. Repair/replace as necessary.
1.2 Clean dirt and/or excess concrete slurry from the mounting area. Apply a bead of approved, preformed flexible butyl joint sealant to the liner’s sealing flange or to the top of the concrete mating surface. Bed the liner into the butyl sealant and apply sufficient pressure to home it to the concrete section creating a seal. It is recommended that the butyl joint sealant be ¼” to 3/8” thick and from ¾” to 1 ½” wide. The butyl joint sealant shall comply with the most current revision of Standard Specification ASTM C990, section 6.2-Butyl Rubber Sealant and Federal Specifications SS-S-210A type 1 and shall be applied as per the manufacturer’s instructions. NOTE: Thicker butyl sealant strips typically used for precast concrete structure joints are too thick and will prevent accurate alignment of the chimney adjustment liner and cast iron frame at the correct grade.
1.3 Precast concrete grade rings (brick/masonry etc.) or ABS grade rings providing adjustment to align the cast iron frame with cover are lowered over top of the liner. Set precast grade rings (brick/masonry etc.) or ABS grade rings into a full bed of non-shrink grout ensuring that the space between each ring or brick course is completely filled. The annular space between the chimney liner and grade rings etc. must also be filled with grout leaving no voids. IMPORTANT NOTE: Precast concrete grade rings must have an inside diameter 1” – 1 ½” greater than the I.D. of the chimney liner being installed. (I.E. 24” I.D. access adjustable chimney liner requires a 25.5” I.D. precast concrete grade ring.)
1.4 Position and home manhole frame internal lip onto a strip of butyl joint sealant (1/4” to 3/8” thick and from ¾” to 1 ½” wide) applied to the top edge of the liner and grout face in the customary manner. The cast iron frame shall be anchored as prescribed by the utility specification or as directed by the engineer.
1.5 Mechanical anchoring attachments through liner surfaces must be sealed with an approved elastomeric sealant. (See approved source recommendations).
1.6 After assembly is complete, the interior surfaces of the liner shall be free of pinholes, cracks, pits or defects which are detrimental to the intended use of the liner. No liner shall have holes or openings which will permit the intrusion of liquids or gasses through the liner wall and into the concrete matrix. There shall be no exposed mortar on any inside liner surface at cast iron frame ring joint which will permit the passage of liquid or gasses through the liner wall to masonry adjustment or precast concrete sections.

FLOWABLE/PUMPABLE GROUTS

SULPHATE RESISTANT GROUTS

NON-SULPHATE RESISTANT GROUTS

BUTYL RUBBER PREFORMED FLEXIBLE JOINT SEALANT

(PRECAST CONCRETE TOP SECTION JOINT ONLY - CONE / FLAT TOP / CAST IRON FRAME)
(SPECIFICATION - ASTM C-990, Section 6.2 Butyl Rubber Sealant

ELASTOMERIC SEALANTS - RESILIENT CURING NON SHRINK CAULK TYPE

(MECHANICAL ANCHOR PENETRATIONS AND REMEDIAL “CAULK” SEAL OF MISCELLANEOUS JOINTS OR SEAMS - 1” WIDTH OR LESS)
NOTE: The sealant manufacturer’s application and surface preparation procedures (including primer) must be followed. This includes recommended maximum joint depth of 1/2” (1/4” minimum thickness) and the use of bond-breaker polyethylene closed cell foam backer rod or polyethylene bond breaker tape.