405 REMOVAL OF EXISTING STRUCTURES

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405.01 DESCRIPTION
Remove and dispose of or recycle, reclaim, reuse, wholly or in part, designated structures.
The Contractor is advised that prints of plans of the existing pertinent structure(s) may be included in the Contract Documents. No responsibility for their accuracy or completeness is assumed by the Administration. Dimensions, details, etc. as shown thereon may not be as built.
405.02 MATERIALS
Not applicable.
405.03 CONSTRUCTION
Protect from any damage all portions of the existing structure scheduled to remain in the rehabilitated structure, and the remaining portions of the existing structure used to maintain traffic, and are scheduled to be removed at a later stage, including bridge deck, the beams, abutments, piers, or any other structure members.
Prior to the start of removal operations, submit a list of the proposed equipment and removal methods for approval. Approval does not relieve the Contractor of responsibility for preserving those portions of the structure designated to remain and be incorporated into the rehabilitated structure or used to maintain traffic.
Immediately halt removal operations if any of these existing elements that are to remain permanently or temporarily are damaged by the Contractor’s operation. Submit the material and work methods proposed to be used to repair or replace the damaged elements to the Office of Structures for approval. Perform the approved method of repair or replacement of the damaged elements to the full satisfaction of the Engineer and the Office of Structures at no additional cost to the Administration. Any delays due to the required repair or replacement shall not be a cause for any claim.
During construction only approved equipment and material (for maximum weight, size, and location) required for a particular operation will be allowed on the existing or newly constructed portion of new bridge. Refer to TC-6.14 and 420.03.15 for additional requirements.
When a structure contains existing protective shields (sheeting or planking) that have been previously placed to contain debris from a deteriorating deck, remove and dispose of the debris and shields at no additional cost to the Administration.
Sheeting and shoring required for the removal of existing structures or portions thereof shall meet 402.03.03.
Unless otherwise specified, the limits of removal shall be 1 ft below the proposed groundline or to the limits necessary to avoid conflict with the proposed construction.
When remaining portions of an existing structure will be exposed to view in the final structure, make a neat 1 in. deep saw cut to separate the removal operations from the remaining concrete. Protect existing reinforcing steel as specified in 421.03.07.
Regardless of whether or not an asphalt mix overlay is depicted in the Contract Documents, or if it is depicted but the actual thickness varies from what is shown, no additional compensation or credit will be made. The provisions of GP-4.05 will not apply.
405.03.01 Removal of Bridge Deck Slabs and Parapets. Protect the public against injury and damage from demolition operations. Erect temporary protective shields to prevent any material or debris from entering roadways, railroads, or waterways. Provide the underclearance specified in TC-6.12. Refer to 405.03.02 and 405.03.03 for additional requirements.
Submit protective shield working drawings as specified in TC-4.01(b). Ensure that flooring and siding have no cracks or openings through which material particles may pass. Ensure that the shields are able to support over their entire area 150 lb/ft2 in addition to their own dead weight.
The preceding weight requirement will be waived when the span to be removed is not over any of the following, or within range of rolling debris reaching any of the following:
(a) Roadway, pedestrian walkway, bikeway, equestrian trail, parking area, navigable water, railroads and railroad property, or other traveled way.
(b) Exposed utilities that are either aerial utilities crossing under the span or utilities located between stringers.
(c) Environmental features such as historic ruins, endangered species habitat, etc.
When the weight requirement is waived but the deck slab is to be sawn into sections and removed by lifting from above, provide protection to prevent any loose particles from reaching restricted areas. In addition, place a temporary construction fence under the area of demolition to prohibit accidental access by employees and pedestrians.
After the Engineer determines that the protective shields have served their purpose, remove and properly dispose of them.
405.03.02 Removal of Bridge Deck Slabs to be Replaced. Refer to the Contract Documents for deck removal restrictions, including sequence of locating and delineating structural elements that will remain in the completed structure, obtaining elevations, saw cutting, and equipment restrictions.
405.03.03 Removal of Existing Bridge. Refer to 405.03.01. Remove existing bridges (including piles) as specified, and from any area that will interfere with proposed construction as specified in 207.03.01.
405.03.04 Reporting Requirements. Recycle, reuse, reclaim as much of the removed structure material (structural steel, rebar, concrete, asphalt, bearings, fencing, etc.) as practical. Report the disposition of all removed structure components to the Project Engineer. Indicate the item description, amount (by weight, linear feet, cubic yard, or each), disposition (recycled, reused, reclaimed, disposed of, stockpiled for future recycling or use), place where material was taken (company name, phone number and address), and date. Report all like items using the same unit of measurement.
405.04 MEASUREMENT AND PAYMENT
The removal of existing bridges and structures or portions thereof will be measured and paid for as specified. The payment will be full compensation for all excavation, backfill, saw cuts, professional engineer services, removal of existing shields and debris, temporary protective shields, temporary sheeting and shoring, hauling, recycling, reuse, reclamation, storage or disposal, reporting and for all material, labor, equipment, tools, and incidentals necessary to complete the work. On deck replacement projects, payment also includes outlining the locations of the flange and floor beams, obtaining all deck elevations specified to determine rebound, computations necessary to place the new deck at the required elevation, and submitting all data for review.
Construction fence used to restrict access under demolition areas will not be measured but the cost will be incidental to the pertinent Removal of Existing Structure item. When an item for construction fence is included in the Contract Documents, that portion of the construction fence used to protect demolition areas will be excluded from the measurement and payment for that item.
405.04.01 Removal of Existing Structures will not be measured but will be paid for at the pertinent Contract lump sum price.
405.04.02 Removal of existing traffic barriers (parapets, railings, etc.) from bridges, including end posts, wing walls, and retaining walls will not be measured but will be paid for at the Contract lump sum price for the pertinent Removal of Existing Traffic Barrier item.
405.04.03 Removal of existing structures for which no specific pay item is included in the Contract Documents will not be measured but the cost will be incidental to other pertinent items specified.