4-2 400-5 Measurement and Payment
The price and payment below will be full compensation for all work required to provide temporary structures including , but not limited to, those items contained in A rticle 400 -1. The work covered by this section will be paid at the contract lump sum price for Construction, Maintenance and Removal of Temporary Structure at Sta. _ ___. Payment will be made under: Pay Item Pay Unit Construction, Maintenance and Removal of Temporary Structure at Sta. ____ Lump Sum
402-1 Description
Excavate as necessary to remove the structure. Dismantle, salvage and stockpile materials and components of the structure and preserve those portions that should remain intact . Dispose of waste and debris. Maintain traffic on the existing structure unless otherwise stipulated by the contract. Do not exceed the posted load limits or damage the existing structure while maintaining traffic . Maintenance of the existing structure, if required, will be performed by Department force s.
402-2 Removal of Existing Structure
A.General Evaluate the current condition of the structure(s) and use approved methods and procedures for dismantling and removing the struc ture(s) in a safe and controlled manner. Bridge inspection reports are available for informational purposes and may be requested from the Structures Management Unit . Upon removal, all materials become the property of the Contractor unless otherwise indic ated in the contract. Dispose of waste and debris from the structure (s) in accordance with Section 802. Perform removal operations while preventing damage to adjacent property. Protect new construction during blasting or other operations necessary for the remo val of the existing structure. Ensure the stability of the structure at all times during the demolition operation. Prior to opening traffic (vehicular, pedestrian, vessel) underneath a partially demolished structure, maintain a sufficient number of girders and cross frames to provide a stable structure and remove all equipment and demolition debris. Any equipment or material that remains on the bridge must be analyzed by an engineer licensed in the State of North Carolina, and approved by the Engineer. Unless otherwise required by the contract, remove substructures down to the streambed or one foot below the natural ground surface. Remove the substructure , including footings or piles as necessary to avoid interference with construction of the proposed structure. Prevent erosion of soil and silting of rivers, streams, lakes, reservoirs, water impoundment, ground surfaces or other property. Do not deposit excavated materials and do not construct earth dikes or other temporary earth structures in rivers, streams or impoundment , or so near to such waters that they are carried into any river, stream or impoundment by stream flow or surface runoff. Do not use equipment in any body of water unless it is impossible or impractical to perform specific operations in any other way. When this oc curs, these operations are specifically allowed through applicable environmental permits and controls to minimize erosion and siltation through best management practices. Do not drop components of structures into any body of water. Remove these existing bridges by sawing
4-3 or other non- shattering methods. Remove any component of a structure from the water so
as to minimize siltation.
B.Requirements for Materials Which Remain the Property of the Department Pile materials salvaged from the structure n eatly on the right of way at locations as directed by the Engineer . Do not use any materials, either temporarily or permanently, which are removed from the structure unless so permitted by the contract. Remove structural materials carefully without damage. Do not use explosives to remove concrete floor slabs from steel superstructures that remain the property of the Department.
C.Requirements for Partial Removal Perform partial removal to the lines indicated in the plan s. Submit a plan for partial removal of bridges for approval before beginning removal. Do not remove concrete by blasting , wrecking balls or other methods that may cause damage to the concrete or reinforcement that is used in the completed structure. Any damage to the portions remaining in se rvice shall be repaired by the Contractor at the Contractor’s expense. Use equipment and methods to remove portions of a concrete structure undergoing widening which are sufficient to obtain plan lines and slopes without undue spalling at edges of the conc rete. Before beginning concrete removal operations involving the removal of a portion of a monolithic concrete element, a saw cut approximately 1 inch deep shall be made to a true line along the limits of removal on all faces of the element that will be visible in the completed work. Concrete shall be carefully removed to the lines indicated in the plans by sawing, drilling, chipping or other methods approved by the Engineer. The surfaces presented as a result of this removal shall be reasonably true and even, with sharp, straight corners that will permit a neat joint with the new construction or be satisfactory for the intended use. Where existing reinforcing bars are to extend from the existing structure into new construction, the concrete shall be rem oved so as to leave the projecting bars clean and undamaged. Where pro jecting bars are not to extend into the new construction, they shall be cut off flush with the surface of the existing concrete. During full -depth removal of deck concrete over beams or girders which are to remain in place, the Contractor shall exercise care so as not to spall, notch, gouge or distort the top flanges. Any damages shall be repaired at the direction of the Engineer and at the expense of the Contractor.
D.Demolition Plan
1.Prior to removal, prepare and submit to the Engineer for review and acceptance a demolition plan for each structure included in the contract indicating the methods and sequence of demolition. The Contractor is encouraged to examine existing structure plans , if available, and visit the site prior to preparing a demolition plan. The Contractor shall be responsible for the methods and sequence of demolition, including effects of the overall stability of each structure being removed. At a minim um, the demolition plan shall include:
a.The name of the C ontractor’s on-site employee designated in responsible charge of all removal operations.
b.The removal method and sequence of removal for each individual structure, including the staging of materials.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 138–139 of 857.