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LANDSCAPE RETAINING WALLS - PDF
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1 SUDAS Standard Specifications Division 9 - Site Work and Landscaping Section Landscape Retaining Walls LANDSCAPE RETAINING WALLS PART - GENERAL.0 SECTION INCLUDES A. Modular Block Retaining Walls B. Limestone Retaining Walls C. Landscape Timber Retaining Walls.02 DESCRIPTION OF WORK A. Construction of modular block retaining walls. B. Construction of limestone retaining walls. C. Construction of landscape timber retaining walls..03 SUBMITTALS Comply with Division - General Provisions and Covenants, as well as the following: A. Upon request, submit certification that products supplied comply with identified specifications. B. Test results on modular blocks, if required. C. Catalog cuts for modular retaining wall blocks and cap stones indicating the size, type, and color proposed for installation..04 SUBSTITUTIONS Comply with Division - General Provisions and Covenants..05 DELIVERY, STORAGE, AND HANDLING Comply with Division - General Provisions and Covenants..06 SCHEDULING AND CONFLICTS Comply with Division - General Provisions and Covenants..07 SPECIAL REQUIREMENTS None. Revised: 202 Edition
2 SUDAS Standard Specifications Division 9 - Site Work and Landscaping Section Landscape Retaining Walls.08 MEASUREMENT AND PAYMENT A. Modular Block Retaining Wall:. Measurement: Measurement will be in square feet for the area of the face of retaining wall, measured from the top of the leveling pad to the top of the wall, including coping or cap stones. 2. Payment: Payment will be at the unit price per square foot of retaining wall. 3. Includes: Unit price includes, but is not limited to, excavation, foundation preparation, furnishing and placing wall units, geogrid (if necessary), leveling pad, subdrain, porous backfill material for subdrain, engineering fabric for subdrain, granular backfill material, suitable backfill material, and shoring as necessary. B. Limestone Retaining Wall:. Measurement: Measurement will be in square feet for the area of the face of retaining wall. 2. Payment: Payment will be at the unit price per square foot of retaining wall. 3. Includes: Unit price includes, but is not limited to, excavation, foundation preparation, furnishing and placing leveling pad, limestone, subdrain, porous backfill material for subdrain, engineering fabric for subdrain, suitable backfill material, and shoring as necessary. C. Landscape Timbers:. Measurement: Measurement will be in square feet for the area of the face of retaining wall, measured from the top of the leveling pad to the top of the wall. 2. Payment: Payment will be at the unit price per square foot of retaining wall. 3. Includes: Unit price includes, but is not limited to, excavation, foundation preparation, furnishing and placing leveling pad, landscape timbers, spikes, reinforcing bar, subdrain, porous backfill material for subdrain, engineering fabric for subdrain, suitable backfill material, and shoring as necessary. D. Excavation and Suitable Backfill Material: If bid separately, excavation for wall construction and placement of suitable backfill material will be measured and paid according to Section 200,.08. E. Fence: Comply with Section 9060,.08, A. F. Safety Rail: Comply with Section 9080,.08, C. 2 Revised: 208 Edition
3 SUDAS Standard Specifications Division 9 - Site Work and Landscaping Section Landscape Retaining Walls PART 2 - PRODUCTS 2.0 MATERIALS A. Modular Block Walls:. Dry-cast Concrete Wall Units: a. Comply with ASTM C 372. Test units and provide samples according to ASTM C 40. b. Provide certification that the blocks comply with the freeze-thaw durability requirements of ASTM C 262 and Iowa DOT Materials I.M c. Furnish from an approved supplier listed in Iowa DOT Materials I.M , Appendix A. d. In lieu of furnishing blocks from an approved supplier, provide blocks from an approved system. ) Iowa DOT Materials I.M , Appendix B lists approved systems. 2) Test the required number of blocks from the lot to be installed according to Iowa DOT Materials I.M ) Submit results of test data to the Engineer. 2. Wet-cast Concrete Wall Units: Comply with Iowa DOT Materials I.M a. Furnish from an approved supplier listed in Iowa DOT Materials I.M , Appendix A. b. In lieu of furnishing blocks from an approved supplier, provide blocks from an approved system. ) Iowa DOT Materials I.M , Appendix B lists approved systems. 2) Test the required number of blocks from the lot to be installed according to Iowa DOT Materials I.M ) Submit results of test data to the Engineer. B. Limestone: Furnish limestone slabs with a flat bottom and top and a clean face. Provide slabs with a minimum depth of 8 inches, or as specified in the contract documents, to ensure stability of the wall. C. Landscape Timbers:. Minimum 6 inch by 6 inch (nominal) pressure-treated landscape timbers rated for ground contact. Ensure timbers are straight, solid, have at least three good sides, and are free of visible dry rot, with only a minor amount of splitting or cracking. Ensure all timbers used in a wall have the same cross-sectional area. 2. Provide 3/8 inch diameter galvanized spikes, 0 to 2 inches long. D. Leveling Pad: Provide material recommended by the wall manufacturer or supplier.. Granular Material: Comply with Iowa DOT Section Concrete: Comply with Section 600. Provide Class C Concrete. E. Subdrain: Comply with Section 4040, Minimum 4 inch diameter pipe. F. Porous Backfill Material (for Subdrain): Comply with Section 4040, G. Engineering Fabric: Provide fabric complying with Iowa DOT Article for subsurface drainage. 3 Revised: 205 Edition
4 SUDAS Standard Specifications Division 9 - Site Work and Landscaping Section Landscape Retaining Walls 2.0 MATERIALS (Continued) H. Unit Fill Material: Comply with Iowa DOT Section 43. I. Backfill Material:. Granular Backfill Material: Comply with Iowa DOT Section 433 when granular backfill material is necessary according to the manufacturer s requirements. 2. Suitable Backfill Material: Comply with Section 200. J. Fence: If the contract documents require a fence, comply with Section K. Safety Rail: If the contract documents require a safety rail, comply with Section Revised: 205 Edition
5 SUDAS Standard Specifications Division 9 - Site Work and Landscaping Section Landscape Retaining Walls PART 3 - EXECUTION 3.0 EXCAVATION AND EMBANKMENT A. Prior to beginning wall construction, compact proposed embankment behind the wall according to the field quality control requirements of Section 200 with the following exception: compact to a minimum of 90% of maximum Standard Proctor Density. B. Excavate to the line and grade specified in the contract documents. Minimize overexcavation. Install sheeting, shoring, or other retention systems as required to ensure the stability of the excavation INSTALLATION A. General:. Height: Overall wall height is limited to 4 feet. 2. Foundation Soil Preparation: Excavate and compact 2 inches of native soil beneath the leveling pad to 95% of maximum Standard Proctor Density. 3. Leveling Pad: a. Construct a minimum 6 inch thick leveling pad of granular material, at a depth such that the entire first course will be completely below the finished grade at the base of the wall. b. Compact granular material with a minimum of three passes of a vibratory plate compactor. 4. Subdrain: a. Install subdrain behind the first course of retaining wall. Place porous backfill material around the subdrain to a minimum cover of 3 inches, and ensure a trench width of at least 8 inches. b. Wrap porous backfill material with engineering fabric. c. Ensure positive drainage on subdrain, and outlet subdrains into a storm sewer or along a slope at an elevation lower than the lowest point in the pipe behind the wall. 5. Fence: If the contract documents require a fence, comply with Section Safety Rail: If the contract documents require a safety rail, comply with Section B. Modular Block Retaining Wall:. Unit Installation: a. Place units side by side for the full length of wall alignment. Establish alignment by means of a string line or offset from the base line. b. Ensure units are in full contact with the leveling pad. c. Install connecting pins. Fill open cells of blocks with unit fill material; tamp the fill. d. Sweep all excess material from top of units and install the next course. Ensure each course is completely filled prior to proceeding to the successive course. e. Place each course so that pins protrude into adjoining courses a minimum of inch or to tolerances recommended by the supplier/manufacturer. Two pins are required per unit. Repeat the above procedure for each course to the top of wall height. f. At the end of each course, where the wall changes elevation, turn the units into the backfill material. Place units to create the minimum radius possible. Install a minimum of three units into the grade. Ensure only the front face of the units is visible from the side of the wall. 5 Revised: 202 Edition
6 SUDAS Standard Specifications Division 9 - Site Work and Landscaping Section Landscape Retaining Walls 3.02 INSTALLATION (Continued) 2. Backfill Material Placement: a. Place each lift of granular backfill material following the erection of each lift of wall. Where reinforcement material is present, roughly level the backfill material before placing and connecting the reinforcement. If necessary, decrease the lift thickness to obtain the specified density. b. At the end of each day's operations, shape the last level of backfill material to allow runoff of rain water away from the wall face. c. Compact granular backfill material according to the field quality control requirements of Section 200 with the following exception: ensure the moisture content falls within a range from 3% under optimum moisture to no more than the optimum moisture content. d. Place and compact backfill material without disturbing or distorting the tieback reinforcement (if present) or the wall. Do not use tamping type rollers or other rollers that may damage the reinforcing. Use light mechanical tampers to achieve the required compaction in a strip 3 feet wide adjacent to the backside of the wall; compaction density testing will not be required within 3 feet of the back of the wall. 3. Tieback Reinforcement Installation: Install tieback reinforcement according to the manufacturer s requirements. C. Limestone Retaining Wall:. Place limestone slabs. Ensure adjacent slabs are in full contact without gaps. 2. Stagger vertical joints so no joint is located closer than 2 feet to a joint in the course below it. 3. After each course is laid, place backfill material behind the wall and compact with hand tools to a density equal to or greater than the existing soil behind the wall. D. Landscape Timbers:. Lay first course of timbers horizontally, ensuring timbers are level. Set back each succeeding course /2 inch. 2. Secure each course to the course below it using spikes placed 2 feet from each joint and spaced at no more than 4 feet. Drill pilot holes in timbers to facilitate installation of spikes. 3. Stagger vertical joints so no joint is located closer than 2 feet to a joint in the course below it. 4. Install tiebacks with length equal to the wall height, perpendicular to the wall face, spaced at 8 feet. Stagger location of tieback on each course. Do not install tiebacks in bottom three courses or upper two courses of timbers. Ensure the end of the tieback is flush with the front of the retaining wall. Attach tieback to course below it using a spike. 5. After each course is laid, place backfill material behind the wall and compact with hand tools to a density equal to or greater than the existing soil behind the wall. END OF SECTION 6 Revised: 202 Edition
7 REVISION Finished Grade Construct entire first course of timbers beneath finished grade. Compacted Backfill Material 3 2 No tie backs in upper two courses or lower three courses of timbers. Stagger tie back location. 2 Tie Back Wall Height. (4'-0'' max.) 4 /2" Setback Each Course Length of tieback equal to wall height. 3 4 Secure each course with spikes. Excavate and place backfill material. Use suitable soil or granular material. Subdrain Finished Grade 8" min. Wrap porous backfill material with engineering fabric. 8" min. Construct a 6" thick X 8" wide (min.) leveling pad. Compacted Foundation SECTION A-A 2'-0" 2'-0" A 3 4'-0'' max. FIGURE SHEET OF 6" A ELEVATION Finished Grade 6" Leveling Pad New SHEET of SUDAS Standard Specifications LANDSCAPE TIMBER RETAINING WALL
9 REVISION Exact dimensions, wall batter, backfill limits, reinforcement, and leveling pad materials and dimensions will be specified by the wall manufacturer. Finished Grade (slope varies) For walls higher than 4 feet, use segmental block retaining wall. Pins or Lip to Ensure Proper Block Setback Cap Stone Topsoil or Suitable Backfill Material Wall Unit (typ.) 4'-0'' max. Finished Grade Geogrid (if required) Excavation Line Granular Backfill Material Geogrid (if required) 6" min. 8" min. 6" min. Wrap porous backfill material with engineering fabric. Excavation Line Subdrain FIGURE SHEET OF Compacted Foundation Construct a 6" thick X 8" wide (min.) leveling pad. TYPICAL SECTION New SHEET of SUDAS Standard Specifications MODULAR BLOCK RETAINING WALL
11 REVISION Compact backfill material as wall construction progresses. 2 Construct entire first course of limestone below finished grade. Batter wall 3 inches per foot Wall Height (4'-0" max.) Compacted Backfill Material Finished Grade 2 8" min. Wrap porous backfill material with engineering fabric. FIGURE SHEET OF 2" Compacted Foundation Subdrain 8" min. Construct a 6" thick X 8" wide (min.) leveling pad. TYPICAL SECTION New SHEET of SUDAS Standard Specifications LIMESTONE RETAINING WALL
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