5-51 Section 502 – Shoring Superstructures
502.0 1 DESCRIPTION . This work shall consist of furnishing the necessary shoring, or vertically jacking of any structure or bearing to a position immediately above its present location, holding it in position during any construction process, lowering it to its supports, removing all shoring or falsework, and cleaning up the site. 502.0 2 CONSTRUCTIO N DRAWINGS . Construction drawings shall be submitted in accordance with the requirements of Subsection 105.06 . The Contractor shall submit the drawings and associated calculations, procedures, and details a minimum of 28 days prior to the anticipated start of work. 502.0 3 CONSTRUCTIO N REQUIREMENTS . Associated details, procedures, and calculations for shoring and jack ing shall conform to the requirements of the AASHTO LRFD Bridge Design Specifications and AASHTO LRFD Bridge Construction Specifications . The Contractor shall be responsible for the strength, capacity, and performance of the construction methods employed. When components or materials that are not otherwise specified for removal are removed from the structure during shoring operations and the components or materials are to be re -installed in the construction, the components or materials shall be ca refully removed and salvaged by the Contractor. Components or materials to be retained and re -installed shall be stored at the location specified in the Contract or as directed by the Engineer. The Contractor shall take every precaution necessary to prevent damage to remaining components or materials and those to be retained for re -installation. Damage to remaining structure components or materials and to those to be re -installed shall be repaired or replaced by the Contractor both to the satisfaction of the Engineer and at no additional cos t to the Agency. 502.0 4 METHO D OF MEASUREMENT . The quantity of Shoring Superstructure to be measured for payment will be on a lump sum basis for each location in the complete and accepted work specified in the Contract or o rdered by the Engineer. Unless otherwise specified in the Contract, all work for removing, salvaging, stockpiling, and re -installing existing structure components or materials during the Contractor’s shoring operations will not be measured for payment but will be considered incidental to Shoring Superstructure.
5-52 The quantity of Shoring Superstructure Bearings to be measured for payment will be on a unit basis for
each bearing shore d in the complete and accepted work as specified by the Contract or ordered by the Engineer. 502.0 5 BASIS OF PAYMENT . The accepted quantity of Shoring Superstructure will be paid for each location specified at the Contract lump sum price. Payment will be full compensation for preparing and submitting construction drawings, details, procedures, and calculations as specified, performing the work specified including assuming all liability for the structure being shored and for furnishing all labor, tools, equipment, materials, and incidentals necessary to complete the work. The accepted quantity of Shoring Superstructure Bearings will be paid for at the Contract unit price for each. Payment will be full compensation for preparing and submitting construction drawings, details, procedures, and calculations as specified, performing the work specified including assuming all liability for the structure being shored and for furnishing all labor, tools, equipment, materials, and incidentals necessary to complete th e work. Partial payments for these items will be made as follows:
a.When the structure or bearing has been jacked and blocked onto its temporary position, a payment of 75% of the Contract unit price will be made .
b.The remaining 25% of the Contract unit price will be paid when all shoring or falsework has been removed and the site cleaned up. Payment will be made under: Pay Item Pay Unit 502.10 00 Shoring Superstructure ................................ ................................ .............. Lump Sum 502.11 00 Shoring Superstructure Bearings ................................ .............................. Each
5-53 Sectio N 503 – Drille D Shafts
503.0 1 DESCRIPTION . This work shall consist of mobilizing and furnishing all materials, equipment, labor, and services necessary to construct drilled shafts in accordance with these provisions, the Plans, Section 506 , Section 507 , Section 541 , and as directed by the Enginee r. 503.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Mortar, Type IV ................................ ................................ ................................ ......... 707.0 1(e) Bar Reinforcement ................................ ................................ ................................ .....713.01 Steel Casing for Drilled Shafts ................................ ................................ .................. 730.03 Water ................................ ................................ ................................ .......................... 745.01 Concrete shall conform to the requirements of Section 541 for Concrete, Class SCC, with the exceptions that the maximum aggregate size shall be 1/2 inch , the 56 day surface resistivity test is not required , and an anti -washout admixture shall not be used f or underwater concrete . Additionally, concrete shall have a blocking assessment of “ No Visible Blocking” during a period equal to the anticipated pour period plus 2 hours, as determined in accordance with ASTM C1621 . Temporary steel pipe piles shall be smooth walled structural steel. Centralizers for bar reinforcement shall be constructed of a non -corrosive material that is compatible with and as durable as the shaft concrete. Water shall have a pH conforming to the slurry requirements listed herein.
a.Mineral Slurry . Mineral (bentonite) slurry shall remain in suspension with sufficient viscosity and gel characteristics to transport excavated material to a suitable screening system. The slurry percentage and specific gravity used to make the suspension shall be sufficient to maintain the stability of the excavation and allow proper concrete placement. The acceptable ranges of values for mineral slurry are specified in Table 503.02A .
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 465–466 of 1,380.