617Cut-Off Walls and Head Walls

Cut-Off Walls and Head Walls

617.1DESCRIPTION

1 This section describes the requirements for constructing concrete cut-off walls and head walls.

617.2MATERIALS

1 Provide materials in accordance with the following: Material Subsection Admixtures 801.4 Aggregate for Concrete 803 Bolts and Fasteners 815.6 Curing Materials 802.1 Fly Ash 801.2 Galvanized Coating 815.14 Portland Cement 801.1 Reinforcing Steel 811.1 Water 814.1

617.3EQUIPMENT

1 Ensure that equipment meets the following: Equipment Subsection Batch Plant 513.3.1 Mixers 513.3.2 Placing Equipment 513.3.3

617.4CONSTRUCTION

1 Use class B concrete or better in accordance with Subsection 513.4.4, Mix Design. Form, mix, place, and cure concrete in accordance with Subsection 513.4, Construction. 2 Construct head walls and cut-off walls perpendicular to the pipe. For corrugated metal pipe, install anchor bolts as specified and prior to concrete placement. Head walls may be poured monolithically or with the footing or cut-off portion and wall or slope paving poured independently. If poured independently, provide a key way as specified and in accordance with Subsection 513.4.11.3, Joints.

Cut-Off Walls and Head Walls SECTION 617

3 Provide and place reinforcing steel in accordance with Section 514, Reinforcing Steel. Field-cut vertical and horizontal steel to maintain a clearance of at least 2 in [50 mm] vertically and horizontally around the pipe.

617.5MEASUREMENT and PAYMENT

1 The engineer will measure Cut-Off Wall (Conc) and Head Wall (Conc) by the cubic yard [cubic meter], using the neat lines specified for the computed volume of concrete. Volumes occupied by reinforcing steel and anchor bolts will not be deducted from the concrete volume. The volume occupied by the pipe’s outside diameter will be deducted.

2 When a head wall consists of a cut-off wall portion and slope paving, the entire installation will be measured as a Head Wall (Conc).

3 The department will pay as follows:

4 Grade fill slopes to match head wall, cut-off wall, or both.

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest Cut-Off Wall (Conc) CY [m3] 0.1 ft [0.05 m] 0.1 CY [0.1 m3] Head Wall (Conc) CY [m3] 0.1 ft [0.05 m] 0.1 CY [0.1 m3]