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Injection bolts prevent slip in bolted connections
To facilitate easy erection, the holes for bolted connections in structural steelwork are fabricated with a clearance to the diameter of the bolt. The normal clearance is 2 mm. This hole clearance causes extra deformation due to slip if the joint is loaded in shear. The load-deformation response will be influenced by the preload in the bolts. When slip is not allowed in bolted connections loaded in shear either slip resistant connections with preloaded bolts or fitted bolts are used. Injection bolts have proved to be a reliable and relative cheap alternative. Injection bolts are bolts in which the cavity produced by the clearance between the bolt and the wall of the hole is completely filled up with a two component resin. Rules for injection bolts have been included in the new European standards for constructional steelwork. In this paper details of this system are presented. Also the design rules are shortly discussed. Injection bolts behave almost the same as fitted bolts. However, they are much cheaper, especially in thick plate packages, where reaming of the holes is very expensive. In some applications, injection may be applied to secure that sudden slip in case of overloading is absolutely avoided. Preloaded injection bolts have a greater design resistance than traditional friction type connections. Therefore the application of preloaded injection bolts reduces the number of bolts and enables more compact connections. In the new storm surge barrier in the waterway between Rotterdam and the North Sea, a great number of M80, M72, M64 and M56 preloaded 8.8 injection bolts are used for the connections in the main hinge (diameter 10 meters) and in the connection between the hinge and the arms. The total thickness of the main plate package is 340 mm. The main reasons for the choice for preloaded injection bolts were the assurance that slip and internal corrosion were completely avoided and also the increase in the design resistance per bolt, compared to traditional high strength friction grip bolts. Since 1970 it has been standard practice in The Netherlands to repair old railway bridges and road bridges with injection bolts.
Injection bolts prevent slip in bolted connections
To facilitate easy erection, the holes for bolted connections in structural steelwork are fabricated with a clearance to the diameter of the bolt. The normal clearance is 2 mm. This hole clearance causes extra deformation due to slip if the joint is loaded in shear. The load-deformation response will be influenced by the preload in the bolts. When slip is not allowed in bolted connections loaded in shear either slip resistant connections with preloaded bolts or fitted bolts are used. Injection bolts have proved to be a reliable and relative cheap alternative. Injection bolts are bolts in which the cavity produced by the clearance between the bolt and the wall of the hole is completely filled up with a two component resin. Rules for injection bolts have been included in the new European standards for constructional steelwork. In this paper details of this system are presented. Also the design rules are shortly discussed. Injection bolts behave almost the same as fitted bolts. However, they are much cheaper, especially in thick plate packages, where reaming of the holes is very expensive. In some applications, injection may be applied to secure that sudden slip in case of overloading is absolutely avoided. Preloaded injection bolts have a greater design resistance than traditional friction type connections. Therefore the application of preloaded injection bolts reduces the number of bolts and enables more compact connections. In the new storm surge barrier in the waterway between Rotterdam and the North Sea, a great number of M80, M72, M64 and M56 preloaded 8.8 injection bolts are used for the connections in the main hinge (diameter 10 meters) and in the connection between the hinge and the arms. The total thickness of the main plate package is 340 mm. The main reasons for the choice for preloaded injection bolts were the assurance that slip and internal corrosion were completely avoided and also the increase in the design resistance per bolt, compared to traditional high strength friction grip bolts. Since 1970 it has been standard practice in The Netherlands to repair old railway bridges and road bridges with injection bolts.
Injection bolts prevent slip in bolted connections
Injektionsbolzen verhindern das Gleiten in verschraubten Verbindungen im Stahlbau
Stark, J.W.B. (author) / Gresnigt, A.M. (author)
Structural Steel Developing Africa, 1996 ; 263-270
1996
8 Seiten, 5 Bilder, 6 Quellen
Conference paper
English
Bolzen , Bolzenverbindung , Stahlbau , Harz , Passen , Scherung (Werkstoff)
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