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Sheet S3d - Page 2 of 2
<br />For heights less than 3 feet, no geogrid is required; for 3 -4 feet height, 1 geogrid or cable -
<br />deadman is required; a minimum of two geogrid layers is required for 4 -5 feet height, as
<br />shown. The toe of the soil at the top of the retaining wall is at the widest part of the tire, as
<br />shown.
<br />Detail B, Sheet S3a (Retaining wall, 5 -10 feet high, uphill slope less than 66 %, using Type 2 tires.)
<br />As shown, the footing is a 6 -inch thick poured mass concrete slab on 6 -inch (minimum, 8 -inch
<br />shown) compacted gravel (CDOT ABS #1 or #6) pad, minimum 6 inches wider than tire width
<br />used. This may be replaced by a tire filed with one -bag soilcrete or lime- stabilized soil, when
<br />approved by the engineer.
<br />Geogrid or cable - deadman is required, at two, five, (and if applicable) eight and eleven
<br />rows, but not at the top of the column. As shown, two layers of geogrid /cable - deadman
<br />are used for 6 -foot wall. At the discretion of the engineer, an additional geogrid layer may
<br />be required below the top tire, based on steepness and condition of the slope above the
<br />wall. The toe of the soil at the top of the retaining wall is at the widest part of the tire, as
<br />shown.
<br />Detail C, Sheet S3a (Retaining wall, 5 -10 feet high, uphill slope less than 66 %, using Type 1 tires.)Refer
<br />to notes for Detail B above. This detail is identical except it uses Type 1 instead of Type 2 tires.
<br />Detail D, Sheet S3a (Retaining wall, 10 feet high and more, uphill slope less than 66 %, vertical.)
<br />As shown, the footing is a 8 -inch thick poured mass concrete slab on 6 -inch (minimum, 8 -inch
<br />shown) compacted gravel (CDOT ABS #1 or #6) pad, minimum 12 inches wider than tire
<br />width used. This may be replaced by a larger soilcrete footing (minimum 12 -inch deep,
<br />minimum 16 inches wider than tires.
<br />Geogrid or cable - deadman is required, at two, four, eight, twelve, (and if applicable)
<br />sixteen, twenty, and twenty -four rows, and a final geogrid layer below the top tire, if two or
<br />more tires are located above the last counted row. Based on steepness and condition of
<br />the slope above the wall, the engineer may require one or two deadmen even if geogrid is
<br />otherwise used, or require alternating layers of geogrid to be fastened to deadmen. The toe
<br />of the soil at the top of the retaining wall shall be placed at the widest part of the tire on the
<br />back side, as shown. Again based on steepness and condition of the slope above, the
<br />normal concrete water cap at the top of the column of tires shall be connected to a
<br />continuous, 3 -inch minimum thickness cap the full width of the tires (not shown).
<br />Detail E, Sheet S3a (Face view of 6 -foot retaining wall)
<br />This detail shows the spacing and placement of the lateral cables connecting the vertical
<br />reinforcement.
<br />Sheet S3b:
<br />Detail F. Sheet S3b. Tilted retaining wall (20 foot high) at 66% angle.
<br />Detail G. Sheet S3b. Tilted retaining wall (10 -foot high) with stabilized 1:2 slope for 10 -feet above.
<br />Geofabric, geogrid and /or dry -laid riprap (rock wall) used for stabilization.
<br />Detail H. Sheet S3b. Terraced 20 -foot retaining wall. When multiple walls of less than 12 feet
<br />individual height are used, setback shall be a minimum of four feet measured from the front of the
<br />lower wall. For walls of greater than 12 feet, setback shall be 1/3 the wall height of the lower wall.
<br />Sheet S3c:
<br />Detail J: Dry laid stone wall (to 10 feet high), vertical unexcavated slope, with or without geogrid.
<br />Detail K: Drylaid stone wall (to 10 feet high), sloped recompacted slope with geogrid.
<br />Detail L: Geogrid reinforced earth wall, with extensive recompacted slope: depth may vary, and
<br />slope may vary from that shown to vertical.
<br />Detail M: Soil nail walls, using drilled or percussion nails (with or without grout). Nails may be plastic or
<br />metal or treated wood. Exterior grouting with fibermesh may be used for strength as well as
<br />appearance.
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