5-342 SECTIO N 551 – PUBLI C PROTECTIO N FOR BRIDG E PROJECTS 551.0 1 DESCRIPTION . This work shall consist of providing protection for vehicular and pedestrian traffic traveling below or adjacent to a bridge that is under construction. 551.0 2 SUBMITTALS . The Contractor shall submit construction drawings in accordance with the requirements of Subsection 105.06 for the methods and sequence of work, including the materials and equipment to be used for the work. The plan shall contain provisions for all stages of construction where any member of the public could be exposed to danger from falling objects or construction operations. Any calculations required to prepar e the construction drawings shall be included in the submittal. 551.0 3 GENERA L REQUIREMENTS . The Contractor shall determine the materials and methods to use for this work based on the conditions at a particular location.
a.Shielding . Should the Contractor choose to use shielding supported by the existing structure, it shall be made of material of adequate strength and size to completely protect the public from any falling objects related to the construction activities. The existing structure shal l be evaluated to determine if it can support the additional loads from the shielding system.
b.Enclosures . Should the Contractor choose to use an enclosure, it shall be made of material of adequate strength and size to completely protect the public from any falling objects related to the construction activities. Any roadway enclosure or containment system shall be of adequate width and height to allow passage of oversize vehicles. If required by the Engineer, vehicular enclosures which are more than 50 f eet long shall have their interior illuminated during daylight hours. Pedestrian enclosures of any length shall have their interior illuminated for the full duration of their use.
c.Diversions . Should the Contractor choose to divert the vehicular and pedestrian traffic from passing beneath the bridge under construction, the diversion course shall be as shown in the approved traffic control plan and meet the requirements of this specification. Diversions are only allowed when specified in the Contract.
d.Interruptions . Should the Contractor choose to interrupt the flow of vehicular or pedestrian traffic below a bridge under construction, flaggers shall be used. An interruption shall be defined as the stopping of traffic. The duration of time for each individual interruption shall not exceed 10 minutes, and the total of the interruptions shall not exceed thirty minutes in any hour. Interruptions are not allowed on interstate highways or limited access highways unless otherwise specified in the Contract. The method or combination of methods the Contractor chooses to use shall be fully operational before any construction work which might endanger the public begins on the bridge. 5-343 551.0 4 METHO D OF MEASUREMENT . The quantity of Public Protection for Bridge Projects to be measured for payment will be on a lump sum basis in the complete and accepted work. The quantities for uniformed traffic officers and flaggers will be measured separately in accordance with Section 630. 551.0 5 BASIS OF PAYMENT . The accepted quantity of Public Protection for Bridge Projects will be paid for at the Contract lump sum price. Payment will be full compensation for preparing a public protection plan, and for furnishing all labor, materials, tools, equipment, and incidentals necessary to complete the work. Partial payments will be made as follows:
a.The first 25% of the Contract lump sum price will be paid once the construction drawings are returned as conforming or conforming with comments .
b.The remaining 75% of the Contract lump sum price will be paid on a prorated basis for the estimated duration of the Contract work remaining. Uniformed traffic officers and flaggers will be paid for separately under Contract items 630.10 00 and
630.15 00, respectively.
Payment will be made under: Pay Item Pay Unit 551.1000 Public Protection for Bridge Projects ................................ ........................ Lump Sum 5-344 SECTION 580 – STRUCTURAL CONCRETE REPAIR
580.01 DESCRIPTION . This work shall consist of the removal and disposal of delaminated and unsound
concrete from an existing superstructure or substructure and its replacement with new Portland cement concrete or concrete repair material. The work under this section shall be performed in accordance with these provisions, the Plans, and Section 541.
580.02 MATERIALS . Materials shall meet the requirements of the following subsections:
Portland Cement ................................ ................................ ................................ ...... 701.02 Portland -Limestone Cement ................................ ................................ ..................... 701.0 5 Epoxy Bonding System, Type V ................................ ................................ .............. 719.0 1(b) Concrete Curing Materials ................................ ................................ ....................... 725.01 Water ................................ ................................ ................................ ....................... 745.01 Concrete Repair Material, Type I ................................ ................................ ............. 780.01(a) Concrete Repair Material, Type II ................................ ................................ ............. 780.01(b) Concrete Repair Material, Type III ................................ ................................ ............ 780.01(c) Concrete Repair Material, Type IV ................................ ................................ .......... 780.01(d) Coarse aggregate for concrete shall meet the requirements of Table 704.02 B. Concrete shall meet the requirements of Section 541 .
580.03 GENERAL REQUIREMENTS . The depth of superstructure repair shall be as defined in Table
580.03A and the depth of substructure repairs shall be as defined in Table 580.03B . For each identified repair area, concrete shall be removed until sound concrete is encountered and the minimum depth of the required repair classification is met. If sound concrete is not encountered within the removal limits for a given repair classification, concrete removal shall continue and the repair shall conform to the requirements of the subsequent r epair classification. If the Contractor removes sound concrete to a depth greater than the maximum allowed in the required classification, and exposes more than half of the bar diameter for reinforcing steel beyond the maximum removal limits , the concrete repair area shall be extended to the next classification of repair at no additional cost to the Agency.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 756–757 of 1,380.