418 PROTECTIVE JACKETS FOR PILES
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- Install protective jacket for piles.
Fine Aggregate 901.01 Portland Cement 902.03, Type II Concrete Admixture 902.06 Water 921.01 Welded Wire Fabric 908.08 Fiberglass Protective Pile Jackets 921.10 and 418.02.01 Anchor/Standoff Devices A185 Stainless Steel Screws A193, Type 303
- 418.02.01 Jackets. Fabricate jackets for new piles in one solid piece with no longitudinal joint. Closure joints on jackets for existing piles need not be self-locking provided the joint can be field formed with fiberglass and is approved. Ensure that the field formed closure joint meets the tensile strength of the jacket. All jackets shall be at least 3/16 in. thick. Ensure that the surfaces of the fiberglass are free of bond inhibiting agents.
- For steel and concrete piles, provide noncorrosive standoffs on the inside face of jackets to maintain the jackets in the required position.
- 418.02.02 Closure Joint Warranty. When closure joints are used for existing piles, furnish the Administration a written 5 year warranty against installation defects, and ensure that the manufacturer submits a similar warranty against manufacturing defects. Submit both prior to starting the installations.
- 418.02.03 Grout. Submit the proposed grout mix design and method of installation for approval.
- Steel and Concrete Piles. Use grout consisting of at least 845 lb/yd3 of cement, 6 ± 1 percent of air entrainment by volume, and proportioned with fine aggregate and water to provide a pumpable mixture. The minimum 28 day compressive strength shall be 3500 psi.
- Ready mixed grout will be permitted by written permission of the Engineer, and shall be from a manufacturer approved by the Office of Materials Technology.
- Timber Piles. Submit grout consisting of water insensitive epoxy and fine aggregate mixed according to the manufacturer’s recommendations.
- Prepare and submit working drawings for approval showing equipment, installation procedure including location of tremie pipes, injection port, method of sealing the bottom of the jacket, and method of support during grout placement. Refer to Section 499.
- 418.03.01 Cleaning Piles. Clean the piles of all surface contamination such as grease, oil, tar, loose rust, loose coatings, and marine organisms.
- Water blast steel and concrete piles with a nozzle pressure of 8000 psi to 20 000 psi, and timber piles with a nozzle pressure of 3000 psi to 3500 psi. Clean the piles within 24 hours prior to placing the grout. Do not place jackets until the cleaning is approved.
- 418.03.02 Preparation of Protective Jackets. Clean and abrasive blast the inside faces of the jackets to remove any agents that will inhibit attachment of anchor devices and bonding of the grout. The Engineer may require these procedures to be repeated if they are not acceptable at the time of placement.
- The Engineer will inspect the protective jackets prior to placement. Repair loose or damaged anchor devices and replace protective jackets deemed unsatisfactory.
- Seal the space between the pile and the jacket at the bottom. Use only external temporary support devices to position the protective jackets during installation. Remove supports before final acceptance.
- 418.03.03 Filling Void. Fill the void between the pile and the protective jacket with grout placed by the tremie method using two tremie pipes or by pumping using an injection port located at the bottom of the protective jacket. Equip tremie pipes with hopper tops. Do not use bottom dump buckets.
- Use approved mixing equipment in preparation and handling of the grout. Remove oil and other rust inhibitors from the mixing drums, stirring mechanisms, and other portions of the equipment in contact with the grout before the mixers are used. Accurately measure all materials by volume or weight as they are fed into the mixer. Mix for at least one minute. The continuously agitated grout may be held in the mixer or agitator no more than one hour, or for 1-1/2 hours when the temperature falls below 70 F.
- Place grout as one continuous operation for each pile. Take care in the placement of grout to obtain a sufficient flow to ensure proper distribution and bonding to the pile.
- If emergency interruptions of continuous grout pumping become necessary, stop the operation and remove the jacket and the grout. Thoroughly clean the pile as specified in 418.03.01 prior to continuing the operation. Do not reuse the pile jacket unless it is removed prior to initial setting of the grout and is approved.
- Finish the top of grout sloped to drain away from the pile. Remove all excess grout from the outside of the piles and jackets after filling.
- 418.03.04 Protective Jacket Inspection. The installation operations will be observed during all phases of construction. In the presence of the Engineer, remove the first two protective jackets installed to provide visual evidence that the desired results are being obtained. Do not begin removal until the grout has set sufficiently to maintain its shape. The Engineer will examine the grout for cavities, honeycombing, and other defects.
- (a) If the grout is satisfactory, the installation operations will be approved. Remove all grout as directed, and clean and reinstall a new jacket in conformance with these Specifications. Do not reuse the original protective jacket.
- (b) If the grout on only one of the installations is unsatisfactory, remove the third protective jacket installed, and inspect. If this inspection is satisfactory, the installation operations will be approved. Reinstall the protective jackets as specified in (a).
- (c) If the grout is unsatisfactory upon removal of the protective jacket on both of the first two piles inspected, or on two out of the three piles inspected as specified in (b), submit modifications to the operations for approval before continuing. Continue these procedures until the installation operations are satisfactory.
- (d) Additional inspections will be performed whenever required.
418.04 MEASUREMENT AND PAYMENT
- The payment will be full compensation for fabricating, furnishing, and installing protective jackets including welded steel wire fabric, grout, excavation, and all material, labor, equipment, tools, and incidentals necessary to complete the work.
- 418.04.01 Protective jackets will be measured and paid for at the Contract unit price per each for the pertinent Protective Jacket for Pile item.
- 418.04.02 Protective jackets will be measured and paid for at the Contract unit price per linear foot (depth) for the pertinent Protective Jacket for Pile item.
- 418.04.03 Protective jacket inspections that are satisfactory and accepted, will be measured and paid for at the Contract unit price per each for the pertinent Protective Jacket Inspection item. Payment will also be full compensation for removal of the jacket, removal of the grout, cleaning, and reinstalling a protective jacket, welded steel wire fabric, and grout.
- 418.04.04 Protective jacket inspections that are unsatisfactory and rejected will not be measured or paid for. The Contractor shall remove the protective jacket, grout, and welded steel wire fabric, and clean the existing structure.