Bridge Crossings with Ductile Iron Pipe
BRIDGE CROSSINGS WITH DUCTILE IRON PIPE
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BRIDGE CROSSINGS WITH DUCTILE IRON PIPE
Introduction
The Ductile Iron Pipe Research Association (DIPRA) periodically receives requests from engineers and contractors concerning recommendations on the design and/or installation of pipelines spanning waterways, highways, and railroads. Because the variables involved in such installations present numerous alternatives and challenges for designers and contractors, DIPRA does not provide recommendations and does not assume responsibility for design or installation practices on such projects. DIPRA does, however, recognize the engineering complexities inherent to bridge crossing pipelines and offers information to assist those involved with this type of installation and points out typical design criteria which should be considered for bridge crossings. Adaptation of the entire pipeline as a unit applied to a bridge structure involves close detail to many parameters in both structures. The following sections cover these parameters in detail.
General
Ductile Iron pipe is centrifugally cast in 18- and 20-foot nominal laying lengths. Nominal diameters range from 3 to 64 inches, with a variety of pressure and special thickness classes. Although Ductile Iron pipe is usually furnished with a cement-mortar lining, optional internal linings also are available for a wide range of special applications. Also, Ductile Iron pipe is normally furnished with an external asphaltic shop coat for a “finished” appearance, although shop-applied primers for special painting systems also are available for above ground use.
Joints
Ductile Iron pipe is furnished with several different types of joints: push-on, PUSH-ON JOINTS mechanical, restrained, ball and socket, flanged, and grooved and shouldered joints. Typically, bridge crossings involve push-on joints, restrained joints, or combinations thereof. Push-on joints (see Figure 1) are excellent for bridges with properly designed and
®
BRIDGE CROSSINGS WITH DUCTILE IRON PIPE
Introduction
The Ductile Iron Pipe Research Association (DIPRA) periodically receives requests from engineers and contractors concerning recommendations on the design and/or installation of pipelines spanning waterways, highways, and railroads. Because the variables involved in such installations present numerous alternatives and challenges for designers and contractors, DIPRA does not provide recommendations and does not assume responsibility for design or installation practices on such projects. DIPRA does, however, recognize the engineering complexities inherent to bridge crossing pipelines and offers information to assist those involved with this type of installation and points out typical design criteria which should be considered for bridge crossings. Adaptation of the entire pipeline as a unit applied to a bridge structure involves close detail to many parameters in both structures. The following sections cover these parameters in detail.
General
Ductile Iron pipe is centrifugally cast in 18- and 20-foot nominal laying lengths. Nominal diameters range from 3 to 64 inches, with a variety of pressure and special thickness classes. Although Ductile Iron pipe is usually furnished with a cement-mortar lining, optional internal linings also are available for a wide range of special applications. Also, Ductile Iron pipe is normally furnished with an external asphaltic shop coat for a “finished” appearance, although shop-applied primers for special painting systems also are available for above ground use.
Joints
Ductile Iron pipe is furnished with several different types of joints: push-on, PUSH-ON JOINTS mechanical, restrained, ball and socket, flanged, and grooved and shouldered joints. Typically, bridge crossings involve push-on joints, restrained joints, or combinations thereof. Push-on joints (see Figure 1) are excellent for bridges with properly designed and
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