Facing the Challenges in Structural Engineering by Hugo Rodrigues Amr Elnashai & Gian Michele Calvi

Author:Hugo Rodrigues, Amr Elnashai & Gian Michele Calvi
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 5.Forming and reinforcement of (a) typical panel, and (b) end panel

Fig. 6.Completed panels at the precast yard before shipping

3.3 Girder and Panel Erection

Girders were shipped and erected similar to conventional bridge construction. Slightly more attention was given to positioning girders in their exact locations. After placing end and intermediate diaphragms, galvanized steel bent plates were welded to the metal tabs embedded in the girder top flange according to girder profile data obtained from shim shots and specified deck profile and haunch thickness. This deck support system also works as side forms for grouting the haunch area later. Therefore, a compressible sealing strip was attached to the top of the bent plates and caulking was used at the bottom of the bent plates, as shown in Fig. 7, to prevent grout leakage. Figure 7 also shows the 12-0.6 in. diameter post-tensioning strands laid over the top flange for each girder line and through the end deviators. Figure 8 shows the 10 #8 (No. 25) Grade 60 (420 MPa) bars installed over the girder top flange (i.e. in the haunch area) over the intermediate pier to provide live load continuity and resist negative moment. Figure 8 also shows the greased rods of the shear connectors cranked up to the calculated elevation that achieves the specified embedment of each rod into the shear pocket. Panel erection was done using a single crane and the 8 lifting inserts embedded in the pockets as shown in Fig. 9a. The installation of the first panel occurred at the pier location as shown in Fig. 9b and remaining panels were then installed in both directions until end panels were installed at the abutment locations. Installation duration was approximately 30 min for the first panel and 20 min for each panel thereafter.

Fig. 7.Deck support system and post-tensioning strands.

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