2012-00589 - new structure - Laserfiche WebLink

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Contractor shall ensure all surrounding structures are protected from the effects of wall excavation. Excavation support, if required, is the responsibility of the Contractor. 4.03 Foundation Preparation A. Following the excavation, the foundation soil shall be examined by the Owner's Engineer to assure actual foundation soil strength meets or exceeds the assumed design bearing strength. Soils not meeting the required strength shall be removed and replaced with infill soils, as directed by the Owner's Geotechnical Engineer. B. Foundation soil shall be proof-rolled and compacted to 95%standard Proctor density and inspected by the Owner's Geotechnical Engineer prior to placement of leveling pad materials. 4.04 Leveling Pad Construction A. Leveling pad shall be placed as shown on the final,P.E.-sealed retaining wall plans with a minimum thickness of 6 inches. The leveling pad should extend laterally at least a distance of 6 inches from the toe and heel of the lowermost SRW unit. B. Granular leveling pad material shall be compacted to provide a firm, level bearing surface on which to place the first course of units. Well-graded sand can be used to smooth the top 1/4 inch to 1/2 inch of the leveling pad. Compaction will be with mechanical plate compactors to achieve 95%of maximum standard Proctor density (ASTM D 698). 4.05 SRW Unit Installation A. All SRW units shall be installed at the proper elevation and orientation as shown on the final,P.E.-sealed wall plans and details or as directed by the Wall Design Engineer. The SRW units shall be installed in general accordance with the manufacturer's recommendations. The specifications and drawings shall govern in any conflict between the two requirements. B. First course of SRW units shall be placed on the leveling pad. The units shall be leveled side-to-side, front-to-rear and with adjacent units, and aligned to ensure intimate contact with the leveling pad. The first course is the most important to ensure accurate and acceptable results. No gaps shall be left between the front of adjacent units.Alignment may be done by means of a string line or offset from base line to the back of the units. C. All excess debris shall be cleaned from top of units and the next course of units installed on top of the units below. D. Two VERSA-Tuff connection pins shall be inserted through the pin holes of each upper- course unit into receiving slots in lower-course units.Pins shall be fully seated in the pin slot below. Units shall be pushed forward to remove any looseness in the unit-to-unit connection. 7