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CITY OF EVERETT SPECIAL PROVISIONS <br /> e. Grout plug to be constructed to withstand loads imposed by grout during placement and <br /> curing without leakage. Contractor to consider using two inflatable seals spaced <br /> approximately 10 feet apart and grout space in-between the two seals with a fast set grout <br /> to form the grout plug. <br /> f. Completely fill annular space. <br /> g. Constructed to allow air and water to escape as grout is introduced. <br /> h. Determine air vent pipe locations by pipeline conditions. <br /> i. Vent pipes may also be used to monitor grout level. <br /> j. Collect and dispose of all displaced water. <br /> 8-31.3(7)D Placement: <br /> Placement of grout shall be by means of one or a combination of the following: <br /> a. Preset threaded grout access outlets in liner pipe wall. <br /> b. Set top-side grout access ports through crown of existing host pipe. <br /> c. Inject through access ports in bulkheads. <br /> 1) Maintain air circulation to ensure safe working conditions and heat dissipation as <br /> a result of cement hydration. <br /> 2) Provide access port for water source if emergency cleanup is required. , <br /> 3) In constricted or small annular space, install 2-inch-diameter PVC pipe air vent to <br /> prevent air from creating large voids in fill. <br /> 4) Inject grout to fill annular space. Engineer will verify if additional grout is needed; <br /> inject additional grout as directed by Engineer. <br /> 8-31.3(7)E Grouting Equipment: <br /> a. Sized to provide amount of grout material required for each stage in a single operation. <br /> b. Capable of mixing grout at required densities and changing density as dictated by field <br /> conditions. <br /> c. Make calculations to determine if gravity flow exerts sufficient pressure to complete <br /> required grouting operation. <br /> 8-31.3(7)F Grouting Pressure: <br /> Gauged pumping pressure shall not exceed 5 psi, which provides a 4:1 factor of safety against <br /> buckling liner pipe. Pressure gauges shall indicate in 1-psi to 2-psi graduations and be located in <br /> grout transport line or very near point of injection. Prevent overstressing or collapsing during <br /> grouting procedure. <br /> When weight of the volume of grout displaced by liner pipe is greater than weight of liner pipe, a <br /> net buoyancy force will exist and cause liner pipe to float. Acceptable methods to negate <br /> buoyancy potential are as follows: <br /> a. Use grout that weighs less than weight of pipe divided by displaced volume of pipe. <br /> b. Increase weight of pipe by filling with water or other material and reduce weight of grout. <br /> c. Use annular bridging such as casing spacers or blocking to hold liner pipe in required <br /> position. <br /> d. Place grout in stages or "lifts" with detailed methodology to determine when a stage is <br /> complete. <br /> Check and record grout density at or close to discharge point every 30 minutes. These records, <br /> combined with records of cement and other materials delivered to Site, as well as volume of water <br /> used shall be submitted to Engineer to confirm volume of grout placed. <br /> SEI to SRI Intertie,SRO8 Rehab Division 8-MISC CONSTRUCTION WO No.-UP3714 <br /> SP-165 <br />