Laserfiche WebLink
PGSF WMVD Storm and Combined Sewer - Construction Package 2 Cast-in-Place Concrete <br />Project No. 180162 03 30 00 - 19 <br /> <br />4. Investigate concrete to be drilled, cored, or sawcut to determine location of <br />reinforcing steel. Locate penetrations to clear existing reinforcing steel. Where not <br />possible to avoid reinforcing steel, consult the Engineer as to acceptability of cutting <br />reinforcing steel and provide new reinforcing systems as directed. <br />5. Locating methods include chipping to expose reinforcing steel, ground penetrating <br />radar, X-ray, or magnetic flux devices. Locates of existing reinforcing shall be by the <br />Contractor. <br />C. Joining New Concrete To Existing: <br />1. Existing concrete surfaces to be joined with new concrete shall be cleaned and <br />roughened by abrasive blasting, bush hammering, or other method to achieve ¼-inch <br />amplitude surface. Remove existing metalwork, embeds, or other interfering items. <br />Coat existing surface with epoxy bonding compound prior to placement of new <br />concrete. <br />D. Post-Installed Anchors and Dowels: <br />1. Use non-destructive methods for locating reinforcement prior to drilling operations. <br />For anchor and dowel locations that interfere with reinforcement, attempt to relocate <br />to avoid drilling through the reinforcement if possible. <br />2. For situations that do not allow relocation, cutting of reinforcement for installation is <br />subject to the following: <br />a. Prior to drilling through reinforcement, the Contractor shall consult the Owner’s <br />Representative or Engineer. <br />b. Drill holes with a hammer drill and carbide bit (core drilled holes are not allowed), <br />followed by brushing and air-cleaning with oil-free compressed air. <br />c. Holes drilled through reinforcement must be in compliance with adhesive anchor <br />assumptions for roughened hole surface typical of a hammer drill and carbide bit. <br />No smooth hole surfaces are allowed. <br />d. Do not cut slab rebar within 24 inches of a supporting wall, column, or an <br />opening in the slab. <br />e. No cutting of rebar is allowed in the middle third of slab spans for anchors with <br />diameters equal to or greater than 3/4 inch. <br />f. Maximum of two rebar may be cut in any 10 foot width of slab. <br />g. Maximum of two rebar may be cut within any 10 foot width of concrete wall. <br />h. Maximum of one rebar may be cut within any 8 foot width of CMU wall. <br />3. For anchors that cannot be moved and that conflict with the above requirements, <br />consult Engineer for direction. It is not acceptable to cut reinforcement in beams, <br />columns, precast members, or stairs. <br />4. Use a pre-manufactured, self-mixing, injectable, two-component, epoxy adhesive, as <br />per Section 03 60 00. Follow manufacturer’s recommendations and ICC Evaluation <br />Report for installation. <br />E. Waterstops: <br />1. Where a waterstop between new and existing concrete is required, install a <br />hydrophilic waterstop, or a retrofit waterstop where indicated on the design drawings <br />for the specific location.