Laserfiche WebLink
F6C� <br />6 ° es <br />II11T111 D <br />�a.a■al■.,L•e� <br />3 _' a F <br />Fig. A. ROCKERY SECTION <br />Fig. B. ROCKERY ELEVATION <br />SCHEMATIC ONLY - NOT TO SCALE <br />NOT A CONSTRUCTION DRAWING <br />NOTES: <br />Rockery construction is a craft and depends largely on the <br />skill and experience of the builder. <br />A rockery is a protective system which helps retard the <br />weathering and erosion process on an exposed soil face. <br />While by its nature (mass, size and shape of the rocks) it <br />will provide some degree of retention, it is not a designed <br />or engineered system in the sense a reinforced concrete <br />retaining wall would be considered designed or engineered. <br />The degree of retention achieved is dependent on the size <br />of the rock used; that is, the mass or weight, and the height <br />of the wall being constructed. The larger the rock, the more <br />competent the rockery should be. <br />Rockeries should be considered maintenance items that <br />will require periodic inspection and repair. They should be <br />located so that they can be reached by a contractor if <br />repairs become necessary. <br />Maximum inclination of the slopes above and behind <br />rockeries should be 2:1 (Herizonlal:Vertical). <br />Minimum thickness of rock filter layer B=12 inches. <br />Minimum embedment D =12 inches undisturbed native soil <br />or compacted fill placed in accordance with report <br />recommendations. <br />Maximum rockery height H = 8 feel. <br />Rockeries greater than 8 feel in height to be installed <br />under periodic or full time observation of the geotechnical <br />engineer. <br />Unless otherwise specified in writing by the rockery <br />"designer," all rocks placed in the lower two-thirds of the <br />wall should be 5 to 6 man rock, 4000 Ibs. or larger. Rocks <br />placed above this level should gradually decrease in <br />size with Increasing wall height using 3 to 5 man rock, <br />700 to 6000 lbs. <br />t.ahth Consultants Inc. <br />..miswN I-aYM1.m++.�m4pRsna 1'minnum,W titMxNs <br />Proj. No. 10558 1 Drwn. GLS Date May 2003 <br />The long dimension of the rocks should extend back W. <br />towards the cut or fill fence to provide maximum stability. <br />Rocks should be placed to avoid continuous joint planes in <br />vertical or lateral directions. Each rock should bear on two <br />or more rocks below it, with good flat -to -flat contact. <br />All rockeries over 4 feet in height should be constructed on <br />basis of wall mass, not square footage of face. <br />Approximate Approximate <br />Size Weight -Ibs. Diameter <br />1 Man <br />50-200 <br />12-18" <br />2 Man <br />200-700 <br />18-28" <br />3 Man <br />700-2000 <br />28.36" <br />4 Man <br />2000-4000 <br />36-48" <br />5 Man <br />4000.6000 <br />48-54" <br />6 Man <br />6000-8000 <br />54.60" <br />Reference: Local quarry weight study using average weights <br />of no less than <br />six rocks of each man size conducted in <br />January, 1988. <br />LEGEND: <br />Drainage materials to consist of clean <br />° <br />angular well -graded quarry spoils, with 4-inch <br />maximum size, or other material approved by <br />the geotechnical engineer. <br />Surface seal; may consist of impervious soil <br />or a fine free draining granular material. <br />tl— tll_ <br />Undisturbed firm Native Soil. <br />lit <br />Drain pipe; 4-inch minimum diameter, <br />perforated or slotted rigid plastic ADS pipe <br />O <br />laid with a positive gradient to discharge <br />under control well away from the wall. <br />TYPICAL ROCKERY DETAIL <br />NATIVE CUT, ANY HEIGHT OVER 4 FT. <br />Checked KMW 1 Date 5/5103 1 Plate 6 <br />