506DRILLED SHAFT CONSTRUCTION

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coring log shall be transported to the ALDOT Bureau of Materials and Tests, Montgomery, Alabama, for inspection. Construction shall not proceed above a drilled shaft until the quality of the shaft, as represented by the core samples, is determined to be acceptable and notification to continue construction is given by the Construction Engineer. If the Engineer determines that the drilled shaft is acceptable, the core holes and the CSL tubes shall be dewatered and grouted. The grout shall be of the same strength or higher than the strength of the concrete used in the original drilled shaft. The contractor may use any of the grout mixes listed in Table 1 of Item 453.03(b)2. with the exception that calcium chloride will not be allowed. The contractor may submit another grout design mix for approval. If the quality of thedrilled shaft is determined to be unacceptable then the Contractor shall construct another foundation to carry the load that will be placed on the shaft or perform corrective work as required by the Department. This foundation or the corrective work shall be constructed without compensation from the Department. The details of the replacement foundation shall be submitted in accordance with the requirements given in Article 105.02 for Working Drawings.

506.11Drilled Shaft Construction Tolerances

The following construction tolerances apply to drilled shafts unless otherwise stated in the contract documents. Drilled shaft excavations and completed shafts not constructed within the required tolerances are unacceptable. The Contractor shall correct all unacceptable shaft excavations and completed shafts to the satisfaction of the Engineer. Materials and work necessary to complete corrections for out of tolerance drilled shaft excavations and/or completed shafts, including engineering analysis and redesign, shall be furnished without either cost to the State or an extension of the contract time of the project.

The drilled shaft shall be within 3 inches {75 mm} of plan position in the horizontal plane at the elevation of the top of the shaft.

The vertical alignment of a shaft excavation shall not vary from the plan alignment by more than 1/4 inch per foot {20 mm/m} of depth. The alignment of a battered shaft excavation shall not vary by more than 1/2 inch per foot {40 mm/m} of depth from the prescribed batter.

The spacers for the reinforcing cage shall have a tolerance of minus 1 inch {25 mm} from the required spacing shown on the plans. The reinforcing steel cage shall be within 1 inch {25 mm} of plan position in the horizontal plane at the elevation of the top of the shaft. After all the concrete is placed, the top of the reinforcing steel cage shall be no more than 6 inches {150 mm} above and no more than 3 inches {75 mm} below plan position.

All casing diameters shown on the plans refer to OD (outside diameter) dimensions. Casing shall be clean, round, straight and free of weld breaks and/or holes that would permit passage of water or wet concrete. When approved by the Engineer, the Contractor may elect to provide a casing larger in diameter than shown in the plans. No payment will be made for additional construction materials used in accommodating the Contractor's request for a larger casing diameter.

The diameter of an excavated socket shall have a tolerance of minus 2 inches {50 mm} from the plan diameter.

The top elevation of the shaft shall have a tolerance of plus 1 inch {25 mm} or minus 3 inches {75 mm} from the plan top of shaft elevation.

Excavation equipment and methods shall be designed so that the completed shaft excavation will have a planar bottom. The cutting edges of excavation equipment shall be normal to the vertical axis of the equipment within a tolerance of +/- 3 % of the diameter. DRILLED SHAFT CONSTRUCTION 347

506.12Method of Measurement

Drilled shaft excavation will be measured by the linear foot {meter} of excavated shaft.

Special drilled shaft excavation will be measured by the linear foot {meter} of excavated shaft.

Drilled shaft construction will be measured by the linear foot {meter} of shaft.

The exploratory drilling below the bottom of a drilled shaft will be measured by the linear foot {meter} of core hole.

Permanent drilled shaft casings will be measured by the linear foot {meter} of casing left in place.

Testing by the CSL method will be measured per each shaft tested.

506.13Basis of Payment

The linear foot {per meter} bid price shall be full compensation for all labor, materials and equipment required to complete and support the excavation. This shall also be full compensation for the utilization of slurry and temporary casings, for the disposal of all surplus excavated materials and for incidentals necessary to complete the work. No additional payment will be made for larger diameter or deeper excavations that are made by the choice of the Contractor.

The linear foot {per meter} bid price shall be full compensation for all labor, materials and special equipment required to complete and support the excavation. This shall also be full compensation for the removal of obstructions, the utilization of slurry and temporary casings, for the disposal of all surplus excavated materials and for incidentals necessary to complete the work. No additional payment will be made for larger diameter or deeper excavations that are made by the choice of the Contractor.

The linear foot {per meter} bid price shall be full compensation for all labor, materials, equipment and incidentals required for the construction of a shaft except for reinforcing steel which will be paid for under Item 502-A. No additional compensation will be made for larger diameter or deeper shafts that are constructed by the choice of the Contractor.

The linear foot {per meter} bid price shall be full compensation for all labor, materials, equipment and incidentals required for coring and sample retrieval.

Payment for a trial drilled shaft will be made under the appropriate production drilled shaft items of 506-A, B, C, F or G as they may apply. No separate payment will be made for cutting off the trial shaft or site restoration.

The linear foot {per meter} bid price shall be full compensation for all labor, materials, equipment and incidentals required for furnishing, painting and installing the casing. No payment will be made for cutoffs. If there is no pay item in the contract for permanent casing then the casing will be paid for as extra work as outlined in Article 104.03, Extra Work.

The price bid for each shaft tested shall be full compensation for all labor, materials, equipment and incidentals necessary to perform the required test and furnish the Engineer with the test results. The bid price shall also include dewatering the tubes and filling the tubes with grout. Where a drilled shaft consists of different shaft diameters, the price bid shall be full compensation for the sonic logging of the complete depth of the drilled shaft, regardless of differences in the diameter of the shaft. The shaft diameter shown in the pay item for sonic logging is for identification purposes and will be the smallest diameter portion of a drilled shaft. ABUTMENT AND BULKHEAD ANCHORS 348

506-A Drilled Shaft Excavation, * Diameter - per linear foot {meter} 506-B Special Drilled Shaft Excavation, * Diameter - per linear foot {meter} 506-C Drilled Shaft Construction, * Diameter, Class ** Concrete - per linear foot {meter} 506-D Exploration Below Drilled Shaft - per linear foot {meter} 506-F Permanent Drilled Shaft Casing, * Diameter – per linear foot {meter} 506-G Crosshole Sonic Logging, * Diameter - per each * Specify diameter of shaft in feet and inches {millimeters}. ** Specify either “DS1”, “DS2” or “DS3”. ABUTMENT AND BULKHEAD ANCHORS

507.01Description

This Section shall cover the work of furnishing and installing complete abutment and/or bulkhead anchor assemblies for precast concrete bridges, timber bridges, and/or timber, metal, or concrete bulkheads, all in accordance with the details shown on the plans and at the locations shown on the plans or directed. Special reference is made to Section 510, Bridges.

507.02Materials

All materials shall comply with the appropriate requirements of Division 800, Materials, and the following: Unless otherwise noted or provided by plan details, all miscellaneous hardware (turnbolts, clamps, bolts, etc.) shall be new galvanized metal, galvanized in accordance with AASHTO M 232. Wire rope (cable) for rope anchor assemblies shall be of 3/4 inch {19 mm} nominal diameter. Wires shall meet the requirements of ASTM Designation A 475 "Siemens Martin" grade having a Class A galvanization coating or an approved equal. Galvanizing of materials completely encased in concrete will not be required. Precast-Prestressed members of anchor assemblies shall comply with the appropriate requirements for precasting and prestressing concrete as noted in Sections 501 and 834.

507.03Construction Requirements

All anchor assemblies shall be erected in accordance with the details shown on the plans or directed. Fabrication of integral parts of an anchor assembly shall be in accordance with the requirements of other appropriate sections of the Specification for the type material involved with specific reference made to Sections 833, 834, 835, and 836.

507.04Method of Measurement

An anchor assembly for an abutment shall consist of the number of sets of tieback cables or arms designated on the plans to connect an abutment to the anchors and includes the connecting system of fastening the cables or arms to the anchors and the abutment. Only one assembly will be measured for each abutment regardless of the number of anchors attached to the abutment. An anchor assembly for a bulkhead shall consist of the number of sets of tieback cables or arms designated on the plans to connect a section of a bulkhead to one anchor and includes the connecting system of fastening the cables or arms to the anchor and bulkhead. A separate assembly will be measured for each anchor attached to a bulkhead. The anchors will be measured and paid for under the appropriate item of piling designated for use as the anchors. The abutment or bulkhead will be measured and paid for under the appropriate item(s) of which the abutments or bulkheads are constructed.

507.05Basis of Payment

Accepted anchor assemblies, measured as noted above, will be paid for at the contract unit price per each which shall be full compensation for furnishing all materials along with the installation of the anchor assemblies, complete in place, attached to the anchor(s) and the abutment or bulkhead, and includes all incidental excavation, backfill, and compaction thereof, miscellaneous hardware, etc., and for all equipment, tools, labor, and incidentals necessary to complete the work.