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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 modular system comprising: a) a plurality of carbon fiber tubes, each carbon fiber tube having a first end and a second end;b) a joint connector located at least one of the first end and the second end of each carbon fiber tube; andc) at least one modular element, wherein the modular element ma

1. A modular system comprising: a) a plurality of carbon fiber tubes, each carbon fiber tube having a first end and a second end;b) a joint connector located at least one of the first end and the second end of each carbon fiber tube; andc) at least one modular element, wherein the modular element mates with at least one joint connector;wherein the joint connector on an end of a first carbon fiber tube is shaped to fit inside an adjoining carbon fiber tube, or mates either with the joint connector on a second carbon fiber tube or with the modular element to form a structure;wherein at least one of the carbon fiber tubes comprises:i) an inner carbon fiber layer; andii) an outer carbon fiber layer; andwherein at least one of the inner and outer carbon fiber layers comprises a braided carbon fiber material. 2. The modular system of claim 1, wherein the joint connector comprises a locking element that locks each carbon fiber tube to an adjoining carbon fiber tube of the structure. 3. The modular system of claim 1, wherein the joint connector comprises a pin joint connector. 4. The modular system of claim 1, wherein at least one of the modular elements is structured such that adjoining carbon fiber tubes meet at an angle. 5. The modular system of claim 1, wherein the modular element comprises a hook connected to the joint connector on at least one of the carbon fiber tubes. 6. The modular system of claim 1, wherein the modular system further comprises a pair of feet, wherein the feet are located on a bottom end of at least one of the carbon fiber tubes such that the feet provide friction for the structure when the feet are placed on the ground. 7. The modular system of claim 1, wherein the joint connector comprises a pair of male joint connectors having a first end connected to an interior surface of the first carbon fiber tube and a second end protruding from an end of the first carbon fiber tube, the second end of the male joint connector having at least one hole formed therein such that, when the second end of the male joint connector is inserted into an interior surface of the second carbon fiber tube, it is secured in place by insertion of pins through the second end of the male joint connector and mating holes in the second carbon fiber tube. 8. The modular system of claim 1, wherein the modular system is a modular ladder system comprising: a) at least two ladder segments, each ladder segment comprising: i) a pair of carbon fiber tubes forming a pair of tubular carbon fiber side rails, each carbon fiber side rail having a first end and a second end;ii) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the carbon fiber side rails of the ladder segment;wherein the joint connector on an end of the first carbon fiber side rail of a first ladder segment is shaped to fit inside the carbon fiber side rail of an adjoining ladder segment or mates either with the joint connector on the second carbon fiber side rail of a second ladder segment or with the modular element to form the structure. 9. The modular system of claim 7, wherein the male joint connectors are bonded to the interior surface of the first carbon fiber tube. 10. The modular system of claim 7, further comprising a pair of reinforcement gussets on an exterior of the second carbon fiber tube. 11. The modular system of claim 7, further comprising a plurality of ridge guides on a top of each male joint connector. 12. The modular system of claim 7, further comprising a dual-pin connector, wherein the dual pin connector comprises a fastener and a bracket having a pair of holes for inserting the pins and a third hole for inserting the fastener such that the second end of the male joint connector is secured in place by insertion of the fastener through a hole in the second end of the male joint connector and mating holes in the second carbon fiber tube. 13. The modular system of claim 12, wherein the fastener is a Zeus-type turn fastener. 14. The modular system of claim 7, further comprising a pair of internal brackets connected to the interior surface of the second carbon fiber tube. 15. The modular system of claim 7, further comprising mounting fasteners permanently mounting the joint connector to the carbon fiber tube. 16. The modular system of claim 7, wherein the joint connector comprises a plurality of machined flat plates. 17. The modular system of claim 8, wherein at least one of the joint connectors is structured to connect two adjoining ladder segments at a 90 degree angle such that one ladder segment is a horizontal ladder segment that further comprises at least one solid panel on top of the at least one rung. 18. The modular system of claim 8, wherein the joint connector on the end of the first carbon fiber side rail of the first ladder segment comprises a locking element that locks the ladder segment to the joint connector on the second carbon fiber side rail of the second ladder segment or to the modular element. 19. The modular system of claim 8, wherein a first joint connector comprises a female connection and a second joint connector comprises a male connection. 20. The modular system of claim 8, wherein the joint connector comprises a pin joint connector. 21. The modular system of claim 8, wherein at least one of the joint connectors is structured such that adjoining ladder segments meet at an angle. 22. The modular system of claim 21, wherein adjoining ladder segments meet at a 90 degree angle. 23. The modular system of claim 21, wherein the modular element comprises a curved angle connector. 24. The modular system of claim 23, wherein the joint connector comprises a splice connection, wherein approximately half of a length of the splice connection is bonded into an end of the carbon fiber side rail and the other half of the splice connection is shaped to fit inside the carbon fiber side rail of an adjoining ladder segment. 25. The modular system of claim 24, wherein the splice connection is filled with a core material. 26. The modular system of claim 23, wherein at least one of the carbon fiber side rails, the joint connector, and the carbon fiber rung is filled with a core material. 27. The modular system of claim 23, further comprising a plurality of carbon fiber gussets connecting the rung to the side rails. 28. The modular system of claim 23, wherein a portion of the rung is located inside each of the carbon fiber side rails and is bonded to an interior of each carbon fiber side rail. 29. The modular system of claim 23, further comprising a carbon fiber flange on each side of the rung that matches a contour of the rung. 30. The modular system of claim 23, further comprising a pair of feet, wherein the feet are located on a bottom end of the pair of carbon fiber side rails such that the feet provide friction for the structure when the feet are placed on the ground. 31. The modular system of claim 23, wherein the modular element comprises a hook connected to the joint connector on a top end of the pair of carbon fiber side rails. 32. The modular system of claim 23, wherein the side rails and the rung are permanently connected by bonding. 33. The modular system of claim 1, wherein the inner carbon fiber layer and the outer carbon fiber layer comprise a carbon fiber braided material. 34. The modular system of claim 1, wherein the outer carbon fiber layer comprises a braided carbon fiber material and the inner carbon fiber layer comprises a material selected from the group consisting of a braided carbon-fiber material and a plain-weave carbon fiber material. 35. A modular ladder system comprising: a) at least two ladder segments, wherein each ladder segment comprises: i) a plurality of carbon fiber tubes, each carbon fiber tube having a first end and a second end, wherein each pair of carbon fiber tubes forms a pair of tubular carbon fiber side rails; andii) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the carbon fiber side rails of the ladder segment; andb) a joint connector located 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 the first carbon fiber side rail of a first ladder segment is shaped to fit inside the carbon fiber side rail of an adjoining ladder segment or mates with the joint connector on the second carbon fiber side rail of a second ladder segment; andwherein at least one of the carbon fiber side rails or the carbon fiber rung comprises: i) an inner carbon fiber layer;ii) an outer carbon fiber layer; andiii) a plurality of carbon fiber strips sandwiched between the inner carbon fiber layer and the outer carbon fiber layer. 36. The modular system of claim 35, wherein the inner carbon fiber layer and the outer carbon fiber layer comprise a carbon fiber woven material. 37. The modular system of claim 35, wherein the outer carbon fiber layer comprises a braided carbon fiber material and the inner carbon fiber layer comprises a material selected from the group consisting of a braided carbon-fiber material and a plain-weave carbon fiber material. 38. The modular system of claim 35, further comprising at least one modular element that mates with at least one joint connector. 39. A modular ladder system comprising: a) at least two ladder segments, wherein each ladder segment comprises: i) a plurality of carbon fiber tubes, each carbon fiber tube having a first end and a second end, wherein each pair of carbon fiber tubes forms a pair of tubular carbon fiber side rails; andii) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the carbon fiber side rails of the ladder segment; andb) a joint connector located 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 the first carbon fiber side rail of a first ladder segment is shaped to fit inside the carbon fiber side rail of an adjoining ladder segment or mates with the joint connector on the second carbon fiber side rail of a second ladder segment; andwherein at least one of the carbon fiber side rails or the carbon fiber rung comprises: i) an inner carbon fiber layer;ii) an outer carbon fiber layer; andiii) a layer of uni-directional carbon fiber material surrounding the inner carbon fiber layer. 40. The modular system of claim 39, further comprising at least one modular element that mates with at least one joint connector. 41. A modular ladder system comprising: a) at least two ladder segments, wherein each ladder segment comprises: i) a plurality of carbon fiber tubes, each carbon fiber tube having a first end and a second end, wherein each pair of carbon fiber tubes forms a pair of tubular carbon fiber side rails; andii) at least one carbon fiber rung perpendicular to the carbon fiber side rails, wherein the carbon fiber rung connects the carbon fiber side rails of the ladder segment; andb) a joint connector located 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 the first carbon fiber side rail of a first ladder segment is shaped to fit inside the carbon fiber side rail of an adjoining ladder segment or mates with the joint connector on the second carbon fiber side rail of a second ladder segment; andwherein at least one of the carbon fiber side rails or the carbon fiber rung comprises: i) an inner carbon fiber layer; andii) an outer carbon fiber layer; andwherein at least one of the inner and outer carbon fiber layers comprises a braided carbon fiber material. 42. The modular system of claim 41, further comprising at least one layer of uni-directional carbon fiber material placed between the inner carbon fiber layer and the outer carbon fiber layer. 43. The modular system of claim 41, wherein the joint connector on the end of the first carbon fiber side rail of the first ladder segment comprises a locking element that locks the ladder segment to the joint connector on the second carbon fiber side rail of the second ladder segment. 44. The modular system of claim 41, wherein the joint connector comprises a pin joint connector. 45. The modular system of claim 41, wherein at least one of the joint connectors is structured such that adjoining ladder segments meet at an angle. 46. The modular system of claim 41, wherein adjoining ladder segments meet at a 90 degree angle. 47. The modular system of claim 41, wherein the joint connector comprises a splice connection, wherein approximately half of a length of the splice connection is bonded into an end of the carbon fiber side rail and the other half of the splice connection is shaped to fit inside the carbon fiber side rail of an adjoining ladder segment. 48. The modular system of claim 47, wherein the splice connection is filled with a core material. 49. The modular system of claim 41, wherein at least one of the carbon fiber side rails, the joint connector, and the carbon fiber rung is filled with a core material. 50. The modular system of claim 41, further comprising a plurality of carbon fiber gussets connecting the rung to the side rails. 51. The modular system of claim 41, wherein a portion of the rung is located inside each of the carbon fiber side rails and is bonded to an interior of each carbon fiber side rail. 52. The modular system of claim 41, further comprising a carbon fiber flange on each side of the rung that matches a contour of the rung. 53. The modular system of claim 41, further comprising a pair of feet, wherein the feet are located on a bottom end of the pair of carbon fiber side rails such that the feet provide friction for the structure when the feet are placed on the ground. 54. The modular system of claim 41, wherein the side rails and the rung are connected by bonding. 55. The modular system of claim 41, further comprising a modular element that mates with at least one joint connector. 56. A modular system comprising: a) a plurality of carbon fiber tubes, each carbon fiber tube having a first end and a second end; andb) a joint connector located at least one of the first end and the second end of each carbon fiber tube;wherein the joint connector on an end of a first carbon fiber tube is shaped to fit inside an adjoining carbon fiber tube or mates with the joint connector on a second carbon fiber tube;wherein at least one of the carbon fiber tubes comprises:i) an inner carbon fiber layer; andii) an outer carbon fiber layer; andwherein at least one of the inner and outer carbon fiber layers comprises a braided carbon fiber material.