| GU BRICK ADJUSTMENT CHIMNEY LINER |
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SCOPE:
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INSTALLATION:
(1) Inspection precast concrete. Top slab / cone for correct access opening diameter and for damage / irregularity which would prevent proper installation and seal. (2) Clean dirt and / or excess concrete slurry from mount area. (3) Assemble precast manhole in the customary manner as prescribed by the precast manufacturer and the approved construction plans. GU Brick Adjustment Chimney Liner for brick masonry or precast concrete ring shall be used at grade to complete assembly of fully lined manhole if adjustment is necessary. To conform accurately to pavement / finished grade as shown on the drawings or as directed by the engineer, it may be necessary to cut GU Brick Adjustment Chimney Liner to required height. (4) Apply bead of approved Butyl Rubber Preformed Flexible Joint Sealant* to GU F.R.P. Liner flange lip on top of manhole flat top or precast concrete manhole cone. "Bed" the GU Brick Adjustment Chimney Liner in bead of Butyl Rubber Preformed Flexible Joint Sealant. Apply sufficient pressure to the chimney to "home" the section and form full gasket seal. It is recommended that the Butyl Rubber Preformed Flexible Joint Sealant* be approximately 1/4" to 3/8" thick by 3/4" to 1 1/4" wide (dimensions vary per sealant manufacturer). *Butyl Rubber Preformed Flexible Joint Sealant "gasket material" shall comply with most current revision of Standard Specification ASTM C990, Section 6.2 - Butyl Rubber Sealant and Federal Specification SS-S-210A type I and shall be applied per manufacturer's instructions. (NOTE: Thicker sealant strips which are typically used for precast concrete structure joints are too thick and may prevent accurately setting the GU Brick Adjustment Chimney Liner and the cast iron frame to the correct grade.) (5) To provide grade adjustment for accurate setting of cast iron frames, brick masonry or precast concrete grade rings** or field poured concrete shall be set on top of manhole flat top slab and/ or precast manhole cone. **Important Note: The precast concrete grade rings must have I.D. access of 1" - 1.5" greater opening diameter then the I.D. of the GU Brick Adjustment Chimney to be installed. (i.e. 24" I.D. access GU convertible collar requires a 25" - 25.5" opening in the precast concrete manhole precast concrete grade rings ) Set precast grade spacer rings or brick masonry in a full bed of non-shrink mortar in customary manner so that the space between each ring or brick course is completely filled and made watertight. (Be sure to apply sufficient mortar to the GU Brick Adjustment Chimney Liner and brick courses so the vertical space between liner and brick masonry is completely filled) ( 6) Set and "home" manhole frame "internal" lip on bead of approved Butyl Rubber Preformed Flexible Joint Sealant* strips applied to the edge of GU Brick Adjustment Chimney Liner and full bed of non shrink mortar in customary manner. The cast iron frame and cover shall be installed as prescribed by utility specifications or as directed by the engineer. (7) There shall be no exposed mortar through inside liner surface at cast iron cover frame ring joint or the precast manhole flat top slab and/ or precast manhole cone section joints which will permit the passage of liquid or gases through the liner wall to masonry adjustment or precast concrete sections. |