Double-sheathed structural cable

Abstract

The structural cable (10) comprises a bundle of load-bearing tendons (15) extending between upper and lower anchoring devices, a first sheath (20) containing the bundle of tendons, and a second sheath (22) arranged around the first sheath, with a gap between the first and second sheaths.

1 . A structural cable of a construction work, the structural cable comprising:
 a bundle of load-bearing tendons extending between upper and lower anchoring devices;   a first sheath containing the bundle of tendons; and   a second sheath arranged around the first sheath, with a gap between the first and second sheaths.   
     
     
         2 . The structural cable as claimed in  claim 1 , wherein the second sheath extends over more than 80% of a length of the bundle of tendons between the upper and lower anchoring devices. 
     
     
         3 . The structural cable as claimed in  claim 1 , wherein the second sheath is at least in part light-transmissive. 
     
     
         4 . The structural cable as claimed in  claim 3 , further comprising light sources arranged in the gap between the first and second sheaths. 
     
     
         5 . The structural cable as claimed in  claim 1 , wherein the first sheath extends as an integral tubular member between a first end adjacent to the lower anchoring device and a second end adjacent to the upper anchoring device. 
     
     
         6 . The structural cable as claimed in  claim 1 , wherein the second sheath is configured to transmit substantially no longitudinal effort to the first sheath. 
     
     
         7 . The structural cable as claimed in  claim 1 , further comprising at least one rope extending along the bundle of tendons in the gap between the first and second sheaths, wherein the second sheath is attached to the at least one rope. 
     
     
         8 . The structural cable as claimed in  claim 7 , wherein the second sheath is attached to the at least one rope using fasteners each having a first part fixed to a rope and a second part protruding transversely to the rope and through a wall of the second sheath, the second part having an end outside the second sheath for receiving a removable connector. 
     
     
         9 . The structural cable as claimed in  claim 7 , wherein the second sheath comprises a plurality of segments assembled along the bundle of tendons, each segment being connected to the at least one rope. 
     
     
         10 . The structural cable as claimed in  claim 9 , wherein each segment of the second sheath is configured to transmit substantially no longitudinal effort to an adjacent segment of the second sheath. 
     
     
         11 . The structural cable as claimed in  claim 9 , further comprising a joint member disposed between an upper end of a first segment of the second sheath and a lower end of a second segment of the second sheath adjacent to the first segment, wherein the joint member is configured to accommodate a longitudinal displacement of the upper end of the first segment relatively to the lower of the second segment. 
     
     
         12 . The structural cable as claimed in  claim 11 , wherein the joint member has an H-shaped cross-section. 
     
     
         13 . The structural cable as claimed in  claim 9 , wherein each segment of the second sheath comprises a plurality of elements assembled together around the first sheath. 
     
     
         14 . The structural cable as claimed in  claim 13 , wherein the elements of a segment of the second sheath are assembled together by fitting a male edge of an element in a female edge of an adjacent element. 
     
     
         15 . The structural cable as claimed in  claim 13 , wherein the elements of a segment of the second sheath are assembled together using clips holding opposing edges of adjacent elements. 
     
     
         16 . The structural cable as claimed in  claim 9 , wherein each segment of the second sheath is at least in part removable to provide access to the gap between the first and second sheaths. 
     
     
         17 . The structural cable as claimed  claim 1 , further comprising spacing members disposed in the gap between the first and second sheaths.