扶手和高架桥接口.pdf

Al Mashaaer Al Mugaddassah Metro Project Mashaaer Mugaddassah MMMP-DD-CWK-SYSTRA-L-00014 Page 1/5 SYSTRA 5 avenue du Coq 75009 Paris France S.A au capital de 15 596 350 RCS Paris B 387 949 530 SIRET 387 949 530 00019 Code APE 742C TVA FR 19387949530 TEL:[phone] FAX:[phone] Email:systra DATE Mrch 4th 2009 REFERENCE MMMP-DD-CWK-SYSTRA-L-00014 FROM M.Kashani TO Mr Sam HAO CC Mr Mak,Mr Mazhang OBJECT Hand rail and Viaduct interface Dear Mr Sam,In order to complete the detailed design of the structures,we need you to choose one of the following Hand rails and Viaduct interface options.Two different structural options are possible:Curved metal plate fixed to the concrete surface Metal plate fixed in cast recess to the concrete surface Both options are defined here after.ARCHITECTURAL CONCEPT To achieve a harmony between the two forms,the guard rail follows the curvature of the viaduct.The design of the two elements incorporates organic forms to soften their impact on the surrounding countryside.Option 1 Construction method:The plate follows the shape of the viaduct.The guard rail is welded to the plate and both are bolted to the concrete.Al Mashaaer Al Mugaddassah Metro Project Mashaaer Mugaddassah MMMP-DD-CWK-SYSTRA-L-00014 Page 2/5 SYSTRA 5 avenue du Coq 75009 Paris France S.A au capital de 15 596 350 RCS Paris B 387 949 530 SIRET 387 949 530 00019 Code APE 742C TVA FR 19387949530 TEL:[phone] FAX:[phone] Email:systra Option 1,Fig.1 Option 1,Fig.2 Al Mashaaer Al Mugaddassah Metro Project Mashaaer Mugaddassah MMMP-DD-CWK-SYSTRA-L-00014 Page 3/5 SYSTRA 5 avenue du Coq 75009 Paris France S.A au capital de 15 596 350 RCS Paris B 387 949 530 SIRET 387 949 530 00019 Code APE 742C TVA FR 19387949530 TEL:[phone] FAX:[phone] Email:systra Option 1,Fig.3 Option 1,Fig.4 Option 2 Construction method:The viaduct is prepared with cast recesses to accommodate the fixing of the metal plate.The guard rail is welded to the plate and both are bolted to the concrete.Conflict with reinforcement is a important issue that such be resolved if we go with this option Al Mashaaer Al Mugaddassah Metro Project Mashaaer Mugaddassah MMMP-DD-CWK-SYSTRA-L-00014 Page 4/5 SYSTRA 5 avenue du Coq 75009 Paris France S.A au capital de 15 596 350 RCS Paris B 387 949 530 SIRET 387 949 530 00019 Code APE 742C TVA FR 19387949530 TEL:[phone] FAX:[phone] Email:systra Option 2,Fig.1 Option 2,Fig.2 Al Mashaaer Al Mugaddassah Metro Project Mashaaer Mugaddassah MMMP-DD-CWK-SYSTRA-L-00014 Page 5/5 SYSTRA 5 avenue du Coq 75009 Paris France S.A au capital de 15 596 350 RCS Paris B 387 949 530 SIRET 387 949 530 00019 Code APE 742C TVA FR 19387949530 TEL:[phone] FAX:[phone] Email:systra Option 2,Fig.3 Option 2,Fig.4 To conclude,we prefer the first option as it allows for a simpler and more flexible construction.Both of the proposed options have to be considered with a pre-cast element(anchor)within the U structure to facilitate the assembly procedure at site.Material characteristics Structural steel to conform to S235:fy=235 MPa Anchor rod(5/8”)shall be straight and shall be according to AASHTO M 314 or ASTM F1554,grade 105 and galvanized according to Article 1006.09 Anchor rods will be installed during the manufacturing operation of the concrete segment.The gap between the concrete and the steel plate will be filled by a grout.Large holes will be provided to allow a proper positioning of the railing.We welcome any comments or suggestions you may have.Please get back to us at your soonest possible convenience so that we may advance with the design.Best regards,M.Kashani