Reinforcement anchoring device

Abstract

A device for anchoring prestressing reinforcement(s) or a structural cable such as a guy, for structural works, in particular made of concrete, including an anchor block having at least one housing configured to receive a clamping jaw for clamping a reinforcement, and an anchor sub-block, having a bearing face on which the anchor block rests and an arched shape, the concave portion of which is oriented toward the structural works.

1 . A device for anchoring prestressing reinforcement(s) or a structural cable such as a guy, for structural works, comprising:
 an anchor block having at least one housing configured to receive a clamping jaw for clamping a reinforcement,   an anchor sub-block, having a bearing face on which the anchor block rests and an arched shape, the concave portion of which is oriented toward the structural works,   an element for distributing forces in the structural works on which the anchor sub-block rests.   
     
     
         2 . The device as claimed in  claim 1 , wherein the anchor sub-block comprises a cementitious material. 
     
     
         3 . The device as claimed in  claim 2 , wherein the cementitious material of the anchor sub-block being high performance concrete or ultra-high-performance tuber concrete. 
     
     
         4 . The device as claimed in  claim 1 , wherein the element for distributing forces in the structural works comprises a cementitious material. 
     
     
         5 . The device as claimed in  claim 4 , wherein the cementitious material of the sub-block is directly in contact with the cementitious material of the distribution element. 
     
     
         6 . The device as claimed in  claim 5 , wherein the contacting surfaces are complementary and/or
 at least one out of the sub-block and the distribution element being produced with small reliefs configured to be crushed under the effect of the compression of the sub-block on the distribution element, and upon being crushed, allows more intimate contact between the sub-block and the distribution element, and/or   the device comprising at least one element inserted between the sub-block and the distribution element, this element being made of non-cementitious material, selected to be crushed under the effect of the compression of the sub-block on the distribution element.   
     
     
         7 . (canceled) 
     
     
         8 . (canceled) 
     
     
         9 . The device as claimed in  claim 6 , wherein the non-cementitious material or materials present at the interface between the cementitious material of the sub-block and that of the distribution element correspond to the shell of one or more lost molds used to mold the sub-block or the distribution element. 
     
     
         10 . The device as claimed in  claim 1 , wherein the angle of opening of the concave portion of the sub-block, defined by the half-angle (a) at the apex of the cone which bears on the edge of the concave face furthest from the anchor block, and which is perpendicular to the concave surface at this edge, being between 15 and 90°. 
     
     
         11 . The device as claimed in  claim 5 , wherein the interface between the sub-block and the distribution element is such that the sub-block can slide in the distribution element under the effect of the compression and become more wedged therein, and at least one divider element intended to facilitate this sliding is arranged at the interface between the cementitious material of the sub-block and that of the distribution, and/or
 the interface between the sub-block and the distribution element having an incline such that the angle (b) formed between the interface and the tangent to the concave face at the interface is acute, and/or   the surfaces of the sub-block and of the distribution element intended to bear against one another being given a shape such as to ensure that, despite the manufacturing tolerances, the distribution of the stresses remains favorable to the good mechanical strength of the sub-block and of the distribution element.   
     
     
         12 . (canceled) 
     
     
         13 . (canceled) 
     
     
         14 . The device as claimed in  claim 5 , the distribution element having a compressive strength greater than that of the concrete of the structure, having a shape widening toward the structural works, and/or being without a strengthening reinforcement. 
     
     
         15 . (canceled) 
     
     
         16 . (canceled) 
     
     
         17 . The device as claimed in  claim 1 , wherein the bearing face of the anchor sub-block being concave toward the anchor block and the anchor block having a convex inner face of complementary shape. 
     
     
         18 . The device as claimed in  claim 1 , the anchor block being made of cementitious material or the anchor block being made of metal and the bearing face being flat, and/or
 the anchor sub-block being without reinforcement, and/or   
       the anchor block having a plurality of housings for receiving clamping jaws for clamping the reinforcements. 
     
     
         19 . (canceled) 
     
     
         20 . (canceled) 
     
     
         21 . (canceled) 
     
     
         22 . Structural works made of concrete comprising at least one prestressing reinforcement, in the concrete structure of the structural works, kept under tension by means of an anchoring device as defined in  claim 1 . 
     
     
         23 . The structural works as claimed in  claim 22 ,
 a concrete structure in which the distribution element is embedded and/or   a duct opening via a flared portion onto the distribution element.   
     
     
         24 . (canceled) 
     
     
         25 . A method for anchoring at least one prestressing reinforcement or structural cable of structural works, comprising: anchoring of the reinforcement within an anchor block of an anchoring device as defined in  claim 1 . 
     
     
         26 . The method as claimed in  claim 25 , comprising tensioning the reinforcement or reinforcements by means of a cylinder bearing on the anchor block or on the sub-block. 
     
     
         27 . A method for manufacturing a device for anchoring prestressing reinforcement(s) or a structural cable for structural works, a device as claimed in  claim 1 , the device comprising:
 an anchor block having at least one housing configured to receive a clamping jaw for clamping a prestressing reinforcement or a structural cable,   an anchor sub-block comprising a cementitious material, having a bearing face on which the anchor block rests and an arched shape, the concave portion of which is oriented toward the structural works,   in which method the anchor sub-block is produced by means of equipment for molding or extrusion of cementitious material.   
     
     
         28 . The method as claimed in  claim 27 , the anchor sub-block being produced in an on-site workshop and/or being arranged at least partially in a recess in the structural works, the anchor block or the sub-block is counter-molded on the other and/or the anchoring device comprising a distribution element, in which method either the sub-block or the distribution element is counter-molded on the other. 
     
     
         29 . (canceled) 
     
     
         30 . (canceled) 
     
     
         31 . (canceled) 
     
     
         32 . A system for anchoring prestressing reinforcements, for an anchoring device as claimed in  claim 1 , comprising clamping jaws for clamping the reinforcements and an anchor block made of UHPFC, having housings, for receiving the jaws and ensuring the reinforcements are wedged under the effect of the tension therein, the anchor block having a face through which the forces are transmitted to the structure, this face being convex toward the structure. 
     
     
         33 . The system as claimed in  claim 32 , the housings for receiving the jaws comprising metal inserts having at least one portion of conical shape, and/or
 the system comprising as many housings for the reinforcements as there are reinforcements, and/or   the anchor block comprising a bursting reinforcement at its periphery, on the side away from the face that transmits the forces, and/or   the anchor block comprising a bursting reinforcement at its periphery, on the side away from the face that transmits the forces, and/or   having an outer surface widening toward the face that transmits the forces.   
     
     
         34 . (canceled) 
     
     
         35 . (canceled) 
     
     
         36 . (canceled) 
     
     
         37 . An anchor sub-block for a device for anchoring prestressing reinforcement(s) or a structural cable such as a guy, for structural works, this device comprising:
 an anchor block having at least one housing configured to receive a clamping jaw for clamping a reinforcement,   an anchor sub-block, having a bearing face on which the anchor block rests and an arched shape, the concave portion of which is oriented toward the structural works,   the sub-block being made of HPC or UHPFC, comprising a bearing face for receiving the anchor block for anchoring prestressing reinforcements, passages for the prestressing reinforcements, a force-transmitting peripheral portion and a central portion defining, on the side opposite to the bearing face, a concave portion, the peripheral portion having an end face joined, forming an acute angle (b) with the tangent to the concave surface having the concave portion, and/or   the sub-block having an outer shape of revolution or with axial symmetry about the axis (X) along which the tension is applied in the reinforcements, and/or   the bearing face being concave in shape, and/or   the bearing face being flat, and/or   the sub-block consisting exclusively of UHPFC, without integrated reinforcement.   
     
     
         38 . (canceled) 
     
     
         39 . (canceled) 
     
     
         40 . (canceled) 
     
     
         41 . (canceled) 
     
     
         42 . A distribution element, for an anchoring device as defined in  claim 1 , comprising a body made of HPC, traversed by a central opening for the passage of the prestressing reinforcements, having a surface receiving an anchor sub-block and a peripheral outer surface which widens in the direction away from the surface, and/or
 the central opening having a cross section that increases toward the anchor sub-block.   
     
     
         43 . (canceled) 
     
     
         44 . An anchoring device for concrete structural works, comprising an anchor block serving to keep under tension prestressing reinforcements or a structural cable, an anchor sub-block on which the anchor block rests, and a distribution element to be embedded at least partially in the concrete structure of the structural works, the anchor sub-block and the distribution element being made at least partially of cementitious materials of compressive strength greater than that of the concrete of the structure, the compressive strength of the anchor sub-block being greater than that of the distribution element, the anchor sub-block, and/or the distribution element,
 wherein the system is a system for anchoring prestressing reinforcements, that comprises clamping jaws for clamping the reinforcements and an anchor block made of UHPFC, having housings, for receiving the jaws and ensuring the reinforcements are wedged under the effect of the tension therein, the anchor block having a face through which the forces are transmitted to the structure, this face being convex toward the structure;   wherein the anchor sub-block is an anchor sub-block for a device for anchoring prestressing reinforcement(s) or a structural cable such as a guy, for structural works, the device comprising:   an anchor block having at least one housing configured to receive a clamping jaw for clamping a reinforcement,   an anchor sub-block, having a bearing face on which the anchor block rests and an arched shape, the concave portion of which is oriented toward the structural works,   the sub-block being made of HPC or UHPFC, comprising a bearing face for receiving the anchor block for anchoring prestressing reinforcements, passages for the prestressing reinforcements, a force-transmitting peripheral portion and a central portion defining, on the side opposite to the bearing face, a concave portion, the peripheral portion having an end face joined, forming an acute angle (b) with the tangent to the concave surface having the concave portion, and/or   the sub-block having an outer shape of revolution or with axial symmetry about the axis (X) along which the tension is applied in the reinforcements, and/or   the bearing face being concave in shape, and/or   the bearing face being flat, and/or   the sub-block consisting exclusively of UHPFC, without integrated reinforcement; and   wherein the distribution element comprises a body made of HPC, traversed by a central opening for the passage of the prestressing reinforcements, having a surface receiving an anchor sub-block and a peripheral outer surface which widens in the direction away from the surface, and/or
 the central opening having a cross section that increases toward the anchor sub-block.