Contactless coupler, precast structure and precast structure construction method using the same

Abstract

The present invention relates to a contactless coupler capable of securing workability and efficiency in precast structure construction by allowing connecting rebars drawn from block-out spaces (S) of precast structures to be connected to each other in a contactless manner without direction connection using a coupler when connecting the connecting rebars to each other, a precast structure manufactured using the same, and a construction method thereof, the contactless coupler includes the connecting rebars drawn from the communicating block-out spaces (S) of the precast structures adjacent to each other, respectively and a plurality of contactless ring connection members disposed to be spaced apart around the connecting rebars that are adjacent and separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars, and the connecting rebars adjacent to each other are connected to each other without the coupler by a frictional force generated by the contactless ring connection members being buried in a finishing grout with which the block-out spaces (S) are filled.

1 . A contactless coupler comprising:
 connecting rebars drawn from communicating block-out spaces (S) of precast structures adjacent to each other, respectively; and   a plurality of contactless ring connection members disposed to be spaced apart around the connecting rebars that are adjacent and separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars,   wherein the connecting rebars adjacent to each other are connected to each other without a coupler by a frictional force generated by the contactless ring connection members being buried in a finishing grout with which the block-out spaces (S) are filled.   
     
     
         2 . The contactless coupler of  claim 1 , wherein the contactless ring connection member ( 120 ) includes a plurality of circular rings disposed to be spaced apart around the connecting rebars ( 210 ) and further formed with protrusions so that a contact area with the finishing grout ( 140 ) is increased. 
     
     
         3 . The contactless coupler of  claim 1 , further comprising a rib connector ( 130 ) including both horizontal channel bodies ( 131 ) in which a plurality of joint grooves ( 132 ) are formed so that left and right side surfaces of the contactless ring connection members ( 120 ) set around both connecting rebars ( 210 ) are insertable and configured to secure connection performance at a connection joint surface of the precast structure ( 200 ) by a frictional force by being installed through the block-out spaces (S) adjacent to and communicating with each other and then buried in the finishing grout ( 140 ). 
     
     
         4 . The contactless coupler of  claim 1 , wherein a rebar head ( 110 ) is further installed on the connecting rebar ( 210 ) so that the contactless ring connection members ( 120 ) are installed around the connecting rebar ( 210 ) on which the rebar head ( 110 ) is installed, and the connecting rebars ( 210 ) adjacent to each other are connected to each other without a coupler by a frictional force generated by the rebar head ( 110 ) being buried in the finishing grout ( 140 ) with which the block-out spaces (S) are filled. 
     
     
         5 . The contactless coupler of  claim 4 , wherein the rebar head ( 110 ) includes: an enlarged body portion ( 111   a ) that is separated and installed to surround an outer peripheral surface of the connecting rebar ( 210 ); end fixing portions ( 111   b ) formed integrally in a ring shape at both side ends of the enlarged body portion ( 111   a ) and installed on an upper surface to be in contact with an end fixing device ( 112 ); and an enlarged node connection portion ( 111   c ) in which an enlarged node portion ( 113 ) is detachably formed as a fastener formed on an outer peripheral surface between the end fixing portions ( 111   b ) on both sides of the enlarged body portion ( 111   a ). 
     
     
         6 . The contactless coupler of  claim 5 , wherein on an inner surface of the enlarged body portion ( 111   a ), an inner groove ( 111   d ) in which a node and a rib of the connecting rebar ( 210 ) are accommodated is further formed at a region where the enlarged body portion ( 111   a ) and the connecting rebar ( 210 ) are in contact with each other, and the inner groove ( 111   d ) is filled with metal melted by welding, and
 the enlarged body portion ( 111   a ) is fixed to the connecting rebar ( 210 ) by welding so that the rebar head ( 110 ) is attached to the connecting rebar ( 210 ) by welding.   
     
     
         7 . The contactless coupler of  claim 6 , wherein the enlarged node connection portion ( 111   c ) has concave portions and convex portions continuously formed as a fastener at a region in which the enlarged node connection portion is in contact with the finishing grout ( 140 ) so that an adhesive force is securable, and the enlarged node portion ( 113 ) is installed on the enlarged node connection portion ( 111   c ) that is the fastener to expand an attachment area so that the adhesive force is improved and acupressure performance is also adjustable depending on a direction. 
     
     
         8 . The contactless coupler of  claim 7 , wherein the enlarged node portion ( 113 ) is installed in a ring shape in which a threaded portion is formed on an inner surface fastened to the enlarged node connection portion ( 111   c ) to be detachable and the enlarged node body ( 111 ) is installed in a form perpendicular to the connecting rebar ( 210 ) so that the acupressure performance is securable. 
     
     
         9 . The contactless coupler of  claim 7 , wherein the end fixing device ( 112 ) is fixed to the connecting rebar ( 210 ) by compressing, the end fixing device ( 112 ) is fastened to the fastener formed on the end fixing portion ( 111   b ) by screw fastening, and the rebar head ( 110 ) is attached to the connecting rebar ( 210 ) by pressing by compressing and fixing the enlarged node body ( 111 ) to the connecting rebar ( 210 ) as the end fixing device ( 112 ) is rotated on the connecting rebar ( 210 ). 
     
     
         10 . The contactless coupler of  claim 9 , wherein on the inner surface of the enlarged body portion ( 111   a ), the enlarged body portion ( 111   a ) and the connecting rebar ( 210 ) are formed so that a node and a rib of the connecting rebar ( 210 ) are in direct contact and the enlarged body portion ( 111   a ) is compressed to a final connecting rebar ( 210 ) as a compressible material, and
 the enlarged node connection portion ( 111   c ) has the concave portions and convex portions continuously formed as the fastener at the region in which the enlarged node connection portion is in contact with the finishing grout ( 140 ) so that an adhesive force is securable, and the enlarged node portion ( 113 ) is installed on the enlarged node connection portion ( 111   c ) that is the fastener to expand the attachment area so that the adhesive force is improved and acupressure performance is also adjustable depending on a direction.   
     
     
         11 . A precast structure manufactured using a contactless coupler including connecting rebars drawn from block-out spaces (S) adjacent to and communicating with each other, respectively, comprising a plurality of contactless ring connection members disposed to be spaced apart around the connecting rebars that are adjacent and separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars,
 wherein the connecting rebars adjacent to each other are connected to each other without a coupler by a frictional force generated by the contactless ring connection members being buried in a finishing grout with which the block-out spaces (S) are filled.   
     
     
         12 . The precast structure of  claim 11 , wherein a rebar head ( 110 ) is further installed on the connecting rebar ( 210 ) so that the contactless ring connection members ( 120 ) are installed around the connecting rebar ( 210 ) on which the rebar head ( 110 ) is installed, and the connecting rebars ( 210 ) adjacent to each other are connected to each other without a coupler by a frictional force generated by the rebar head ( 110 ) being buried in the finishing grout ( 140 ) with which the block-out spaces (S) are filled. 
     
     
         13 . A method of constructing a precast structure manufactured using a contactless coupler, comprising:
 (a) a step of allowing connecting rebars to be separated from each other and adjacent to each other by adjoining the precast structures in which the connecting rebars drawn from block-out spaces (S), respectively, are formed so that the block-out spaces (S) communicate with each other; and   (b) a step of disposing a plurality of contactless ring connection members to be spaced apart around the connecting rebars separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars and installing the contactless ring connection members using a rib connector that includes both horizontal channel bodies in which a plurality of joint grooves are formed so that left and right side surfaces of the contactless ring connection members set around both connecting rebars are insertable and is installed through the block-out spaces (S) adjacent to and communicating with each other.   
     
     
         14 . The method of  claim 13 , further comprising, after the step (b), (c) a step of connecting the connecting rebars ( 210 ) adjacent to each other without a coupler by a frictional force generated by the contactless ring connection members ( 120 ) and the rib connector ( 130 ) being buried in a finishing grout ( 140 ) with which the block-out spaces (S) are filled. 
     
     
         15 . The method of  claim 13 , wherein a rebar head ( 110 ) is further installed on the connecting rebar ( 210 ) in the step (a) so that the contactless ring connection members ( 120 ) are installed around the connecting rebar ( 210 ) on which the rebar head ( 110 ) is installed, the connecting rebars ( 210 ) adjacent to each other are connected to each other without a coupler by a frictional force generated by the rebar head ( 110 ) being buried in a finishing grout ( 140 ) with which the block-out spaces (S) are filled, and the rebar head ( 110 ) includes an enlarged body portion ( 111   a ) that is separated and installed to surround an outer peripheral surface of the connecting rebar ( 210 ), end fixing portions ( 111   b ) formed integrally in a ring shape at both side ends of the enlarged body portion ( 111   a ) and installed on an upper surface to be in contact with an end fixing device ( 112 ), and an enlarged node connection portion ( 111   c ) in which an enlarged node portion ( 113 ) is detachably formed as a fastener formed on an outer peripheral surface between the end fixing portions ( 111   b ) on both sides of the enlarged body portion ( 111   a ). 
     
     
         16 . The method of  claim 13 , wherein the precast structure ( 200 ) in the step (a) includes a culvert, an underground tunnel, and an above-ground tunnel as a steel concrete member manufactured in advance using a formwork, and the separate connecting rebars ( 210 ) are connected to each other without a coupler by the contactless coupler ( 100 ) even when the connecting rebars are not on the same central axis.