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A dual-use ladder and bridge modular system preferably includes tubes, gussets, flanges, and/or joints. In a preferred embodiment, the tubes, gussets, flanges, and/or joints are made of carbon fiber. A method connects and disconnects modular carbon fiber ladder segments. Another method creates a lig

A dual-use ladder and bridge modular system preferably includes tubes, gussets, flanges, and/or joints. In a preferred embodiment, the tubes, gussets, flanges, and/or joints are made of carbon fiber. A method connects and disconnects modular carbon fiber ladder segments. Another method creates a lightweight carbon-fiber beam with exceptionally high stiffness and strength using a combination of carbon-fiber braid material, uni-directional cloth, and pultruded carbon-fiber strips. A carbon fiber ladder segment and tube connectors are also disclosed.

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1. A carbon fiber ladder structure, comprising: a) a pair of tubular carbon fiber side rails, each rail having a first end and a second end;b) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the side rails of the ladder segment; and

1. A carbon fiber ladder structure, comprising: a) a pair of tubular carbon fiber side rails, each rail having a first end and a second end;b) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the side rails of the ladder segment; andc) a spliced joint connector located at at least one of the first end and the second end of each carbon fiber side rail;wherein the spliced joint connector on an end of a first carbon fiber side rail of a first ladder segment reversibly mates with a sleeve formed by a hollow portion of an interior of a second carbon fiber side rail of a second ladder segment;wherein, when at least two ladder segments are joined by the spliced joint connector and the sleeve, they form a segmented structure;wherein the rung is detachable from the side rails; andwherein the rung comprises a uni-directional carbon fiber inner layer and a braided carbon fiber layer. 2. The carbon fiber ladder structure of claim 1, wherein approximately half of a length of the spliced joint connector is bonded into an end of the carbon fiber side rail and the other half of the spliced joint connector is shaped to fit inside the sleeve of the carbon fiber side rail of an adjoining ladder segment. 3. The carbon fiber ladder structure of claim 1, wherein the rung is sized such that two rungs fit into the hollow portion of the carbon fiber side rail for storage when the rungs are detached from the side rails. 4. The carbon fiber ladder structure of claim 1, wherein the spliced joint connector is made from carbon fiber. 5. The carbon fiber ladder structure of claim 1, wherein the spliced joint connector is made from carbon fiber and has a core filled with material that has a lighter density than carbon fiber. 6. The carbon fiber ladder structure of claim 1, wherein the braided carbon fiber layer is a braided carbon fiber outer layer. 7. The carbon fiber ladder structure of claim 1, wherein the rung further comprises a fiberglass outer layer, wherein the braided carbon fiber layer is located between the uni-directional carbon fiber inner layer and, the fiberglass outer layer. 8. The carbon fiber ladder structure of claim 1, wherein the rung further comprises a non-slip coating applied to an outer surface of the rung. 9. The carbon fiber ladder structure of claim 1, further comprising a ring-shaped carbon fiber flange on each side of the rung. 10. The carbon fiber ladder structure of claim 1, wherein the carbon fiber side rails are set at an angle relative to a vertical direction. 11. The carbon fiber ladder structure of claim 1, wherein the carbon fiber side rails comprise: a) an inner carbon fiber layer;b) an outer carbon fiber layer; andc) a plurality of uni-directional carbon fiber strips sandwiched between the inner carbon fiber layer and the outer carbon fiber layer. 12. A carbon fiber ladder structure, comprising: a) a pair of tubular carbon fiber side rails, each rail having a first end and a second end;b) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the side rails of the ladder segment; andc) a joint connector located at at least one of the first end and the second end of each carbon fiber side rail;wherein the joint connector on an end of a first carbon fiber side rail of a first ladder segment reversibly mates with the joint connector on a second carbon fiber side rail of a second ladder segment;wherein, when at least two ladder segments are joined by the joint connectors, they form a segmented structure;wherein the rung is detachable from the side rail; andwherein the rung comprises a uni-directional carbon fiber inner layer and a braided carbon fiber layer. 13. The carbon fiber ladder structure of claim 12, wherein the joint connector comprises a curved angle connector forming an angle between 30 and 150 degrees. 14. The carbon fiber ladder structure of claim 12, wherein the rung is sized such that two rungs fit into a hollow interior portion of the carbon fiber side rail for storage when the rungs are detached from the side rails. 15. The carbon fiber ladder segment structure of claim 12, wherein the braided carbon fiber layer is a braided carbon fiber outer layer. 16. The carbon fiber ladder structure of claim 12, wherein the rung further comprises a fiberglass outer layer, wherein the braided carbon fiber layer is located between the uni-directional carbon fiber inner layer and, the fiberglass outer layer. 17. A carbon fiber ladder structure, comprising: a) a pair of tubular carbon fiber side rails, each rail having a first end and a second end;b) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the side rails of the ladder segment; andc) a spliced joint connector located at at least one of the first end and the second end of each carbon fiber side rail;wherein the spliced joint connector on an end of a first carbon fiber side rail of a first ladder segment reversibly mates with a sleeve formed by a hollow portion of an interior of a second carbon fiber side rail of a second ladder segment;wherein, when at least two ladder segments are joined by the spliced joint connector and the sleeve, they form a segmented structure;wherein the rung is detachable from the side rails; andwherein the rung is made of a uni-directional carbon fiber inner layer and a braided carbon fiber outer layer. 18. A carbon fiber ladder structure, comprising: a) a pair of tubular carbon fiber side rails, each rail having a first end and a second end;b) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the side rails of the ladder segment; andc) a spliced joint connector located at at least one of the first end and the second end of each carbon fiber side rail;wherein the spliced joint connector on an end of a first carbon fiber side rail of a first ladder segment reversibly mates with a sleeve formed by a hollow portion of an interior of a second carbon fiber side rail of a second ladder segment;wherein, when at least two ladder segments are joined by the spliced joint connector and the sleeve, they form a segmented structure;wherein the rung is detachable from the side rails; andwherein the rung is made of a uni-directional carbon fiber inner layer, a braided carbon fiber middle layer, and a fiberglass outer layer.