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Avoid open or sealed longitudinal joints in the riding surface which may become a safety hazard Specify that live load vibrations from the existing structure be minimized during deck pour and curing Provide adequate clearance between proposed driven piles and existing piles, especially for battered piles Bearing xity and expansion devices should be similar in both widened and existing bridges 4 Summary: The following constructability issues need to be evaluated: Duration of construction Maintenance and protection of traf c Underwater work: The health and safety of construction personnel may be of concern if the water depth is high Trained divers will be required Access to site: A temporary road for transportation of materials and equipment adjacent to the channel bank may be dif cult to construct Temporary works: Temporary construction works may be required More economical alternatives implementing quick construction and safety need to be carefully evaluated Safety of personnel: OSHA safety standards must be followed Environmental risks: Pollution of rivers from construction material may occur The channel needs to be cleaned Approvals for stream encroachment permits would be necessary Impact on existing utilities: The effect of driving sheeting or bed armoring on existing utilities needs to be evaluated Utilities may be relocated in such cases Coordination and approval from utility companies would be required Impact on right-of-way: A construction easement needs to be determined and permits obtained Specialized work: The contractor performing such tasks needs to train his construction crew for such techniques Availability of labor and plant: Some types of bridge construction, such as gabions, interlocking blocks, and stone pitching, require experienced labor Since local labor may not be familiar with the work, bringing labor from long distances may be expensive Limited vertical clearance under the bridge: It may be dif cult to construct a cofferdam or drive sheeting under a bridge if a restricted vertical clearance exists Usually, there is more than one method of construction because of variations in the contractor s resources However, in bridge repairs not many alternate solutions may be feasible and a single solution may be the most appropriate If design takes into account the appropriate method of construction, there will be fewer constructability issues However, changes in structural details during the long construction process may be necessary due to unforeseen eld conditions such as the discovery of different soils Coordination between design and construction teams is essential for answering RFI s and issuing agreed DCN s as revisions to contract drawings to nish work within the construction schedule For delicate repairs a more stringent QC procedure may be necessary 5 Designs should be reviewed to identify any of the following potential construction problems: Is the sequence of construction practical How will each component be constructed Can the structure actually be constructed in accordance with the plans Is the design economical or can it be constructed with conventional equipment by experienced contractors
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Transportation and storage of materials at the site MPT: How will traf c be maintained at each stage of construction ROW during construction: How will the contractor access the site MSF: Maintaining stream ow during construction for a bridge over a stream Dewatering the work area Removal of forms and temporary sheet piles Utility relocations Delays in acquiring construction permits, affecting the schedule
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The following steps are required: 1 All t up shall be at no load condition During fabrication and erection, lack of t among components may result from imperfect workmanship and thermal changes, etc It would lead to stress concentration and locking in of stress and should be prevented 2 Temporary bracing or support will be pre-designed for use during construction to prevent any failure Reactions at temporary supports and forces in bracing will be computed using standard software 3 Welded and bolted connections may cause brittle failures They will be designed to withstand construction stresses 4 Staged construction may present additional issues When staging is done in sequence, it is important to match the existing camber with the camber of the adjacent girder being placed 5 For skewed deck construction, any lift-off of the girder end at bearings during deck placement will not be permitted 6 Girder length will be based on 68 F temperature Holes in girders should match anchor bolt holes which have a clearance of as little as 1 16 in around the anchor bolt Correction in length needs to be applied before drilling holes in the eld 7 Bearing rotation during erection due to girder dead weight should not exceed theoretically computed values Additional bearing rotations may cause malfunction of the bearing Expansion bearings have slots, the midpoint of which should coincide with the center line of support at 68 F Adjustment will be required at other temperatures
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