4-76 Section 452
452-1 Description
Construct sheet pile retaining walls consisting of steel sheet piles for permanent applications. Provide CIP reinforced concrete coping as required. Construct sheet pile retaining walls based on actual elevations and wall dimensions and with the required embedment below bottom of wall elevations in accordance with the contract and accepted submittals. Define “sheet pile wall” as a sheet pile retaining wall.
452-2 Materials
Refer to Division 10. Item Section Joint Filler 1028 -1 Low Modulus Silicone Sealant 1028 -3 Portland Cement Concrete, Class A 1000 Reinforcing Steel 1070 Steel Sheet Piles 1084 -1
452-3 Sheet Pile Wall Surveys
The plans typically show a plan view, typical sections, details, notes and an elevation or profile view (wall envelope) for each sheet pile wall. Before beginning sheet pile wall construction, survey existing ground elevations along wall face locations and other elevations in the vicinity of sheet pile wall locations as needed. For proposed slopes above or below sheet pile walls, survey existing ground elevations to at least 10 feet beyond slope stake points. Based on these elevations, finished grades and actual sheet pile wall dimensions and details, submit wall envelopes for acceptance. Use accepted wall envelopes for construction.
452-4 Construction Methods
A.Sheet Pile Installation Install sheet piles with tolerances that meet Subarticles 450- 3(B)(1) and 450 -3(B)(2). Install sheet piles with the minimum required pile tip elevation s in accordance with Subarticle 450 -3(D).
B.Concrete Coping Construct CIP concrete coping in accordance with Section 420. Do not remove falsework until concrete a ttains a compressive strength of at least 2 ,400 psi. P rovide a Class 2 surface finish for coping that meets Suba rticle 420 -17(F). Construct coping joints at a maximum spacing of 10 f eet. Make 1/2 inch thick expansion joints that meet Article 420 -10 for every third joint and 1/2 inch deep grooved contraction joints that meet Subarticle 825 -10(B) for the remaining joints. Stop coping reinforcement 2 inches on either side of expansion joints.
C.Backfilling and Sealing Joints When concrete coping is required, do not backfill behind sheet pile walls until concrete attains a compressive strength of at least 3 ,000 psi. Backfill for sheet pile walls in accordance with Article 410-8. Seal joints above and behind sheet pile walls between coping and concrete slope protection with silicone sealant .
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 212–212 of 857.