TÜRK LOYDU - 1915 ÇANAKKALE BRIDGE PROJECT
TÜRK LOYDU is a Classification Society and a Conformity Assessment Body performing classification and statutory services, inspection, certification and notified body activities, has constituted and been managing its organization to protect independence and impartiality values and maintain the continuity of improvement.
"A Type" Inspection Body activities are performed in accordance with “ISO/IEC 17020 General Criteria for the Operation of Various Types of Bodies Performing Inspection” standard and accredited by TÜRKAK.
Notified Body activities which are composed of conformity assessment activities are performed in accordance with the relevant directives of EU legislations and Guide to the Implementation of Directives Based on New Approach and Global Approach.
Türk Loydu has gave services in the 1915 Çanakkale Bridge project within the scope of main cable fabrication inspection, hanger cable fabrication inspection, pile pipes fabrication inspection, bridge shaft fabrication inspection, gantry rail winch fabrication inspections.
PROJECT INFORMATION
The suspension bridge has a 2023 meter long main span and 770 meter long side spans. The bridge girder is of twin stiffened steel box girder construction, with stiffened steel plate decks with asphalt surfacing. The girder is structurally continuous for the full length of the suspension bridge and has a total length of 3563 m. The twin box girders are connected by transverse steel box girders. The main cables are formed from pre-fabricated parallel wire strands (PPWS). The towers are of stiffened steel plate construction.
In the project, the main cable wire diameter is 5.75mm, minimum proof load of wire is 1470 MPa. Tie-down cable wire diameter is 7mm, minimum proof load of wire is 1550 MPa.
WHY 3rd PARTY INSPECTION?
In order to reduce the risk and ensure that the project progresses at minimum quality requirements in accordance with the standards and technical specifications, it is of high importance that third-party surveillance companies take part in the projects. Not only for safety of building but also in products with 3rd party inspection, insurance costs are reduced which is the other advantage of 3rd party inspection.
Because of bridges are exposed to a wide variety of loads such as wind load and earthquake load and operate under dynamic loads, they are structures of high importance in terms of safety. Accordingly, after the construction standard of the bridge is selected, the execution class is determined according to EN 1090-2. Bridge structures are usually built according to the highest execution classes; EXC3 and EXC4. The choice of these execution classes affects the tolerances and extra tests to be applied during the fabrication of the bridge, the documentation requirements, and the traceability requirements.
MAIN AND HANGER CABLES INSPECTION
Inspections were carried out in accordance with EN 1090-2: 2018, the main standard of the project, and in accordance with the inspection and test plan, which was created according to technical specifications and standards of the project. In the overseas leg of the project, the main cable fabrication inspections were carried out in Zhejiang, China, the hanger cable fabrication inspections were carried out in Changzhou, China, the Gantry rail crane fabrication inspections were carried out in Shanghai, China, and the fabrication controls of the wrapping and compaction machines were carried out by Türk Loydu personnel in Wuxi, China.
The stages of cable manufacturing are inspected by socket manufacturing controls, wire bundled and socketting inspections, measurement dimension inspections, witnessed mechanical laboratory tests, witnessed chemical analysis tests, witnseed cable wrapping inspections, visual and non-destructive inspections, and the conformity of the fabrication of cables to the standards has been checked and reported to owner. If any non conformity detected a NCR report issued and followed by Türk Loydu inspectors.