520.01 Description.
b.Payment will be made under Item No .: 517-A * Handrail - per linear foot {meter} 517-B Beam Type Handrail, Type Posts - per linear foot {meter} 517-C Type Railing Stair Railing - per set 517-D Aluminum/Galvanized Steel Sidewalk Handrail - per linear foot {meter} * Galvanized Steel, G alvanized Steel Pipe, Ornamental, or Cast -In-Place Concrete REPAIR OR RAISING EXISTING BRIDGES
520.01 Description.
This Section shall cover the work of furnishing all materials, tools, equipment, labor, falsework, or cribbing and all incidental items necessary to repair members or portions of an existing bridge or change the elevation of an existing bridge as may be required by the detailed plans. The work shall also include the removal and satisfactory disposal of all waste material, damaged portions replaced, and all falsework and/or temporary bracing, etc.
520.02 Materials.
Since the majority of the work required under this Section is primarily a work item, materials not to be incorporated into the completed struc ture shall be of such quality as to serve the needs adequately. However, any material which is to become a part of the completed structure shall meet the requirements of Division 800, Materials, for the respective type of member or part involved.
520.03 Construction Requirements.
a.Repairing of Existing Bridge . The Contractor shall assemble all materials and equipment required to complete the repairs on any particular member of the bridge and shall adequately strut and brace members which are to be cut to ensure maintaining correct distance between joints and provide temporary load carrying members and supports during such time as members are cut, prior to the cutting of any main member. Prior to beginning work, the Contractor shall submit to the Engineer his plans for bracing main members for approval.
b.Raising Existing Bridge . The Contractor shall furnish sufficient equipment of adequate capacity to raise any particular unit of the bridge, or the entire bridge, without injury to same, giving (1) unifor m support and bearing at sufficient intervals and (2) adequate falsework, each as approved by the Engineer to support safely the portion of or the entire bridge while being raised until it is set on its new permanent supports. Prior to beginning work the C ontractor shall submit to the Engineer (1) his plans for falsework and (2) list of equipment proposed for use. Both of these must be approved before the actual raising operation begins. When raising of a bridge involves a truss structure, the Contractor ma y be permitted to remove existing trusses from the bridge piers and store them at an approved storage site, provided a satisfactory method of removal, transporting, and re- installation of the trusses is submitted and approved by the Bridge Engineer. In suc h event the Contractor shall make all necessary arrangement for and furnishing of any storage area. NOTE: Storage areas must be approved by the Engineer, and a site will not be considered for approval unless the proposed site is under the direct control of the Contractor and its location is either on the project or in close proximity thereto.
520.04 Method of Measurement.
Each existing bridge to be repaired, raised, or bridge having a portion or portions of same to be repaired or raised will be shown on t he plans and in the proposal by its station number, and for the purpose of measurement and payment will be considered a complete and separate unit.
521.03 Selection of Co ating System.
520.05 Basis of Payment.
a.Unit Price Coverage .
1.Item 520- A. Payment for repairs to existing bridge shall be made at the contract bid price (lump sum) which shall be payment in full for all material, equipment, tools, labor, falsework, struts, support, and incidentals necessary to complete the work required by this Section and detailed in the plan s.
2.Items 520- B AND 520 -C. Payment will be made at the respective contract lump sum prices for items of raising existing bridges or portions of existing bridge at designated stations listed in the contract. The lump sum price shall be payment in full for the furnishing of all equipment, tools, labor, falsework and/or cribbing, storage area, and incidentals necessary to complete the work including the removal and satisfactory disposal of falsework and/or cribbing.
b.Payment will be made under Item No .: 520-A Repairs to Existing Bridge, Station _____ - per lump sum 520-B Raising Existing Bridge, Station _____ - per lump sum 520-C Raising Portion of Existing Bridge, Station _____ - per lump sum SECTION 521 STEEL BRIDGE COATING
521.01 Description.
This Section shall cover the work of applying coatings to steel for new construction and to existing bridges in the field for the protection of structural steel portions of bridges. Special requirements are given for the removal of coatings on existing bridges and for the disposal of the removed coating material. The requirements for coating are applicable regardless of whether or not payment for the coating is included in the payment for the steel (usually new construction) or i s a separate payment for the field application of the coating on an existing bridge.
521.02 Materials.
Coating materials shall conform to the requirements given in Section 855, "Coatings, Paints, Enamels, and Varnishes for Metal and Wood Structures". Requi rements for coating are also given in Section 836, "Structural Steel, Fasteners and Miscellaneous Metals". There are three basic types of coating systems. These systems are: • System 1, zinc primer with various types (acrylic, epoxy, urethane) of intermediat e and top coats; • System 2, acrylic primer, intermediate and top coats; • System 3, epoxy mastic. The required dry film thickness and the required color of each coat are given in Article 855.05.
521.03 Selection of Coating System.
The type of required coat ing system will be shown on the plans or designated elsewhere in the contract. The coating system proposed for application shall be selected from the list of approved coating components if a proprietary coating system is not shown on the plans. The Contra ctor shall submit a written notification of the following: • the name and address of the supplier of the coating system; • the product names of each coat proposed for application; • the supplier number from the list of approved coating systems. If the coating is proposed for application on existing structures the Contractor shall give this written notification to the Project Manager at least 14 calendar days prior to the beginning of the application of the coating. If the coating system is propos ed for new construction the Contractor shall give this written notice to the Project Manager and forward a copy of the notification to the Bridge Engineer prior to, or with the first submittal of the structural steel shop drawings.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 389–389 of 934.