Section Cover Page
Section 16126
2000-06-01Underground Ductbanks

Use this Section where underground ductbanks are required.

This Master Specification Section contains:

.1This Cover Sheet

.2Data Sheet - General

.3Specification Section Text:

1.General

1.1Related Sections

1.2Detail Drawing

1.3Coordination

2.Products

2.1Materials

3.Execution

3.1Installation

.4Detail Drawing:

16126.01 Ductbank Drain Assembly Detail

BMS Basic Master Specification
Alberta Infrastructure
Master Specification System / Page 0
Section 16126
Plan No:Underground Ductbanks
Project ID:Page 1

1.General

1.1RELATED SECTIONS

.1Service Connections:Division 1.

.2Trench Excavating and Backfilling:Section02319.

.3Concrete:Section03300.

1.2DETAIL DRAWING

.1Following detail drawing is appended hereto and forms part of this Section:

.116126.01: Ductbank Drain Assembly Detail

SPECNOTE:Delete Detail Drawing article if the detail is included on drawings.

1.3COORDINATION

.1Coordinate manhole elevations with final site elevations as indicated on drawings.

.2Coordinate work of this Section with work specified in Section 02319.

2.Products

2.1MATERIALS

.1Conduit:[Galvanized rigid steel] [Rigid polyvinyl chloride] [Rigid fiberglass reinforced epoxy].

.2Conduit Spacers:fabricated plastic.

.3Concrete:as specified in Section 03300 and as follows:

.1Strength:[20] []MPa.

.2Aggregate Size:20mm maximum.

.3Colour:[red] [] permanent additive type.

.4Reinforcing Steel:as specified in Section 03300 and as follows:

.1[] stirrups at [] mm spacing.

.2[] M continuous bars.

.5Ductbank Drain Assembly:fabricated [50] []mm PVC drainage assembly with saddle cutouts for each conduit [as indicated in detail 16126.01] [as detailed on drawings].

SPECNOTE:Provide a Ductbank Drain Assembly when ductbank system does not include manholes or another means of draining ductbanks of water.

SPECNOTE:Ductbank Drain Assembly detail may be included as part of this section or on drawings. Edit this Section accordingly.

3.Execution

3.1INSTALLATION

.1Install [reinforced] concrete encased underground ductbank[s] [and manholes] at locations indicated on drawings.

.2Build [ductbank] [and manholes] on undisturbed soil [or on well compacted granular fill not less than 150mm thick].

.3Install ductbank with a minimum [150] []mm per 30m length slope.

.4Provide [25] []mm drain holes in bottom of each conduit.

SPECNOTE:Drain holes only required when Ductbank Drain Assembly is used.

.5Install base spacers at not greater than [1.5] []m intervals.

.6Install conduit using preformed interlocking rigid plastic intermediate spacers to maintain spacing between ducts at not less than [50] [75] []mm horizontally and vertically.

.7Stagger joints in adjacent duct layers by [600] [900]mm and make joints watertight.

.8Use galvanized rigid steel conduit for all bends in excess of [20] [] degrees and for all sections extending above finished grade level.

.9Use bell ends at duct terminations.

.10Use conduit to duct adapters when connecting to threaded galvanized rigid steel conduit.

.11Terminate duct runs with a duct coupling set flush with the end of concrete duct envelope when deadending ductbank for future extension.

.12Encase ductbank with [50] [75]mm thick concrete envelope.

END OF SECTION