The invention includes a tube fabricated for use in a tubeway, which includes a plurality of tube segments. Each tube segment forms a portion of the tube. The tube segment is extruded in a form to allow for joining with other tube segments to form the a tube. Prestressed metallic wires included within each tube segment. The plurality of tube segments are assembled to form the tube. End fittings are provided on each opposing end of the tube segments forming the tube to facilitate joining the tube to other tubes end-to-end. At least one post-tension cable is attached to opposing end fittings on the tube segment. The invention further includes an on-site method for fabricating and assembling the tubeway from the prestressed concrete tube segments.

A pipe joint and elongated cementitious pipe is formed by joining abutting ends of adjacent pipe sections with a fiber reinforced composite material without the need for the pipe sections to have other connection means, such as the standard bell and spigot end connections. Also disclosed is a cementitious pipe including at least two cementitious pipe sections having ends that are joined together with a fiber reinforced polymer composite material. The cementitious pipe sections and resulting cementitious pipe may have a substantially uniform wall thickness and substantially uniform inner and outer diameters near the opposite ends of the pipe sections. Also provided is a method for joining cementitious pipe sections with a fiber reinforced composite material to manufacture an elongated cementitious pipe, such as an elongated concrete pipe.

A segment for an annular structure is disclosed. The segment includes an arcuate body extending between a first end and a second end. The segment includes a first plurality of interlocking portions extending from the first end and a second plurality of interlocking portions extending from the second end. Each interlocking portion includes a first leg and a second leg partially embedded in the arcuate body and a connecting portion connecting the first leg and the second leg, the connecting portion external to the arcuate body. The segment also includes a flange proximal to the first end and the second end of the arcuate body. Each flange includes a first spacing portion that extends radially outward from the outside surface and a second extending portion that extends distally from the main body portion.

Methods are disclosed for on-site construction of continuous concrete pipes. In some embodiments a tunnel is bored in the ground instead of traditional excavation of a ditch for the pipe. At least one layer of concrete or other similar materials is sprayed/applied on the wall of the tunnel. Optionally a mesh of reinforcement material is laid over the concrete layer(s). Subsequently additional layer(s) of concrete is sprayed on the previous layers. The spraying process in these methods may be manual or mechanized. In other embodiments the soil removed from the tunnel may be used to mix the concrete. Utilizing the disclosed methods, new continuous pipes may be formed within old pipes or damaged pipes.

Embodiments of a method and a mold for producing a concrete pipe comprising a basic body made of concrete and a plastic inner pipe for conducting a liquid. The method comprises introducing a mold core into the plastic inner pipe, introducing the plastic inner pipe into an outer mold and pouring concrete into an intermediate space between the outer mold and the plastic inner pipe to form the basic body. After the concrete has solidified, the plastic inner pipe remains as inner formwork in the basic body made of concrete and the mold core is removed.

Embodiments of a method and a mold for producing a concrete pipe comprising a basic body made of concrete and a plastic inner pipe for conducting a liquid. The method comprises introducing a mold core into the plastic inner pipe, introducing the plastic inner pipe into an outer mold and pouring concrete into an intermediate space between the outer mold and the plastic inner pipe to form the basic body. After the concrete has solidified, the plastic inner pipe remains as inner formwork in the basic body made of concrete and the mold core is removed.

A prong is configured for use with a concrete reinforcement element and includes first and second legs positioned opposite first and second sides of the prong and a bridge portion connecting distal ends the legs, where the bridge portion forms a first end of the prong. The legs extend from the bridge portion to a second end of the prong opposite the first end, and each of the legs has a proximal end at the second end of the prong. The proximal end of the first leg is bent toward the second leg, and the proximal end of the second leg is bent toward the first leg, such that the proximal ends of the legs overlap each other. Inner surfaces of the proximal ends of the legs define engagement surfaces configured to engage a tie wire, enabling the proximal ends to be connected to the tie wire.

The invention relates to corrosion-protected ductile cast iron pipes, a method for producing corrosion-protected ductile cast iron pipes, and the use of specific compositions for producing corrosion-protected ductile cast iron pipes. More particularly, the invention relates to corrosion protection for ductile cast iron pipes using latex-modified cement mortars based on calcium-aluminum cements.

The invention relates to corrosion-protected ductile cast iron pipes, a method for producing corrosion-protected ductile cast iron pipes, and the use of specific compositions for producing corrosion-protected ductile cast iron pipes. More particularly, the invention relates to corrosion protection for ductile cast iron pipes using latex-modified cement mortars based on calcium-aluminum cements.

A modular pipe and a method of installing the pipe uses a first pipe section positioned in end to end relation with a second pipe section, the first and second pipe sections being precast from a cement-based material, wherein each pipe section has an outer surface, a flow passage, a first end, and a second end. Each end has a connection profile, an axis, and an end face that is perpendicular to the axis. A collar surrounds and secures the connection between adjacent ends. The collar is constructed from a plurality of collar elements. Each collar element overlaps the pipe connection and engages the connection profile along a portion of the perimeter of each of the first end of the second pipe section and the second end of the first pipe section.