Connection system for tubular members
A tubular connector system for joining two pipe ends without the necessity of rotating the pipe ends. A coupling has opposing tapered ends. Each of the tapered ends slopes inwardly from an inner extent to an outer extent to form a respective mouth opening of the body. Each tapered end of the coupling has a contoured surface which is made up of a series of alternating helical spline wedges. The wedges are oppositely tapered from an inner extent to an outer extent, whereby the helical spline wedges form an alternating series of lands and grooves on the body as viewed from the respective mouth openings. The two opposing pipe ends have mating engagement surfaces which engage and mate with the contoured surfaces of the coupling as one pipe end is pushed toward the other during assembly.
1. A support structure for a tunnel segment of poured concrete, where the tunnel segment makes up a part of a tunnel system, each tunnel segment having a supporting super structure made up of a series of coupled tubular pipe segment assemblies, each coupled pipe segment assembly comprising:
a first pipe having a box end with an interior and with a specially machined interior surface;
a second pipe having a box end with an interior and with a specially machined interior surface;
a coupling body having a first tapered end and a second tapered end joined together at a respective inner extent thereof, each of the tapered ends sloping inwardly from the inner extent to an outer extent thereof to thereby form a respective mouth opening of the body;
wherein each of the first and second tapered ends has a specially contoured exterior surface, the exterior surface being comprised of a plurality of helical spline wedges, each of which is oppositely tapered from an inner extent to an outer extent thereof in width, whereby the helical spline wedges form an alternating series of lands and grooves on the exterior surface of the body as viewed from the respective mouth openings;
wherein each of the helical spline wedges has a dovetail shape when viewed in cross section;
the first and second tapered ends being shaped to mate with the specially machined surfaces provided within the box ends of the first and second pipes, respectively, to engage the respective pipe ends by axial movement of one pipe relative to another and without rotating the respective first and second pipes;
whereby the box ends of the first and second pipes touch upon completion of the connection with the coupling being completely received within the interior of the first and second pipes, respectively; and
wherein the coupled tubular pipe segments are arranged along a curved axis when assembled as a part of the supporting super structure of the tunnel system.
2. The support structure for a tunnel segment of claim 1 , wherein an assembly force is applied to the coupling in order to form a connection between two pipe sections, and wherein the assembly force causes the coupling to rotate less than 360° before the pipes are fully connected.
3. The support structure for a tunnel segment of claim 1 , wherein the helical spline wedges are arranged on the specially contoured surface of the coupling along a dominant axis, the dominant axis being longitudinal rather than helical.
4. The support structure for a tunnel segment of claim 1 , wherein an assembly force is applied to the coupling in order to form a connection between two pipe sections, and wherein the assembly force causes the coupling to rotate less than 45° before the pipes are fully connected.
5. The support structure for a tunnel segment of claim 1 , wherein the first and second tapered ends of the coupling body each have a given axial length as measured along a central longitudinal axis of the coupling body, and wherein the axial lengths are at least about 0.5 times the outside diameter of the respective pipe bodies being joined and less than about 1.5 times the outside diameter of the pipe body being joined.
6. The support structure for a tunnel segment of claim 1 , wherein the first and second tapered ends of the coupling body each have a given axial degree of taper with respect to a central longitudinal axis of the coupling body, and wherein the given axial degree of taper is in the range from 1 to 36°.
7. The support structure for a tunnel segment of claim 1 , wherein the first and second tapered ends of the coupling body each have a given axial degree of taper with respect to a central longitudinal axis of the coupling body, and wherein the given axial degree of taper is in the range from 1 to 20°.