4-77 452-5 Measurement and Payment
Sheet Pile Retaining Walls will be measured and paid in square feet. Sheet pile walls will be measured as the square feet of wall face area with the pay height equal to the difference between top and bottom of wall elevations . Define “top of wall” as top of coping or top of piles for sheet pile walls without coping. Define “bottom of wall” as where finished grade intersects the front of sheet piles and no measurement will be made for portions of sheet pile walls below bottom of wall elevations. The contract unit price for Sheet P ile Retaining Walls will be full compensation for providing submittals, labor, tools, equipment and sheet pile wall materials, installing sheet piles, excavating, hauling and removing excavated materials , placing and compacting backfill material and supplying sheet piles , backfill, coping and any incidentals necessary to construct sheet pile walls. The contract unit price for Sheet Pile Retaining Walls does not include the cost for ditches, fences, handrails, guardrail or barriers associated with sheet pile walls as these items will be paid for elsewhere in the contract. Where it is necessary to provide backfill material from sources other than excavated areas or borrow sources used in connection with other work in the contract, payment for furnishing and hauling such backfill material will be paid as extra work in accordance with
Article 104 — 7. Placing and compacting such backfill material is not considered extra work but
is incidental to the work being performed. Payment will be made under: Pay Item Pay Unit Sheet Pile Retaining Walls Square Foot
453-1 Description
Construct CIP gravity retaining walls consisting of CIP concrete supported by and connected to concrete footings. Construct CIP gravity retaining walls based on actual elevations and wall dimensions in accordance with the contract, accepted submittals and if included in the plans, standard CIP gravity wall detail. Define “CIP gravity wall” as a CIP gravity retaining wall.
453-2 Materials
Refer to Division 10. Item Section Geotextiles, Type 1 1056 Joint Filler s 1028 -1 Low Modulus Silicone Sealant 1028 -3 Masonry 1040 Portland Cement Concrete, Class A 1000 Reinforcing Steel 1070 Subdrain Coarse Aggregate 1044 -2 Subdrain Fine Aggregate 1044 -1 Use geotextiles and subdrain aggregate for subsurface drainage at weep holes and reinforcing steel for dowels.
453-3 Gravity Wall Surveys
The plans typically show a plan view, typical sections, details, notes and an elevation or profile view (wall envelope) for each CIP gravity wall. Before beginning CIP gravity wall
4-78 construction, survey existing ground elevations along wall face locations and other elevations
in the vicinity of CIP gravity wall locations as needed. For proposed slopes above or below CIP gravity walls, survey existing ground elevations to at least 10 f eet beyond slope stake points. Based on these elevations, finished grades and actual CIP gravity wall dimensions and details, submit wall envelopes for acceptance by the Engineer . Use accepted wall envelopes for construction.
453-4 Construction Methods
Control drainage during construction in the vicinity of CIP gravity walls. Direct run off away from CIP gravity walls and backfill. Contain and maintain backfill and protect material from erosion. Excavate as necessary for CIP gravity walls in accordance with the plans. Em bed bottom of footings at least 2 f eet below bottom of walls shown in the plans. If applicable and at the Contractor’s option, use temporary shoring for wall construction instead of temporary slopes to construct CIP gravity walls. Define “temporary shoring for wall construction” as temporary shoring not shown in the plans or required by the Engineer including shoring for OSHA reasons or the Contractor’s convenience. Notify the Engineer when foundation excavation is complete. Do not place concrete for footings until excavation depth and foundation material are approved by the Engineer . Construct CIP gravit y walls at elevations and with dimensions shown in the plans and in accordance with Section 420. Use dowels for construction joints at top of footings as shown in the plans. Extend top of walls at least 6 inches above where finished grade intersects back of CIP gravity walls. Provide a Class 2 surface finish for exposed surfaces of CIP gravity walls that meets Subarticle 420-17(F). Construct wall joints at a maximum spacing of 10 f eet. Make 1/2 inch thick expansion joints that meet Article 420 -10 for ev ery third joint and 1/2 inch deep grooved contraction or sawed joints that meet Subarticle 825- 10(B) or 825 -10(E) respectively for the remaining joints. Construct 3 inch diameter weep holes on 10 f oot centers along CIP gravity walls. Provide subsurface dr ainage at weep holes in accordance with Article 414 -8. Exit weep holes just above finished grade and slope holes at 1 in/ft through CIP gravity walls so water drains out of front of walls. When single faced precast concrete barrier is required in front o f and against CIP gravity walls, extend weep holes through barrier at the same slope. Do not remove forms or backfill behind CIP gravity walls until concrete attains a compressive strength of at least 2,400 psi. Backfill for CIP gravity walls in accordanc e with Article 410 -8. If a brick veneer is required, construct brick masonry in accordance with Section 830. Anchor brick veneers to CIP gravity walls with approved brick to concrete type anchors in accordance with the manufacturer’s instructions. Space anchors no more than 16 inches apart in the vertical direction and no more than 32 inches apart in the horizontal direction with each row of anchors staggered 16 inches from the row above and below.
453-5 Measurement and Payment
CIP Gravity Retaining Walls will be measured and paid in square feet. CIP gravity walls will be measured as the square feet of wall face area with the pay height equal to the difference between top of wall and top of footing eleva tions. Define “top of wall” as top of CIP concrete. The contract unit price for CIP Gravity Retaining Walls will be full compensation for providing submittals, labor, tools, equipment and CIP gravity wall materials, excavating, hauling and removing excava ted materials , placing and compacting backfill material and supplying concrete, dowels, subsurface drainage, weep holes and any incidentals necessary to construct CIP gravity walls. The contract unit price for CIP Gravity Retaining Walls will also be full compensation for brick veneers, if required.