Plastic micro packer and construction method using it

Abstract

Disclosed are a plastic micro packer for repairing cracks of structure and a method for repairing middle or low pressure cracks using the plastic micro packer: The micro packer is connected to a hole formed in a crack to inject, repairing solution into the crack of a concrete structure, and includes: a hollow rubber sleeve having a screw portion formed on the inner surface thereof; a hollow packer body having a screw coupling portion screwed with the screw portion and a nozzle portion connected to a repairing solution injector; and a cove; member connected to the nozzle portion to prevent leakage of repairing solution. The screw portion of the rubber sleeve has a wide top and a narrow bottom, and thereby, is closely contacted to the hole while the lower portion of the screw portion is expanded in a radial direction when the screw: coupling portion is screwed with the screw portion. A flange portion is formed at the front end of the rubber sleeve to prevent excessive induction of the rubber sleeve into the hole.

1 . A plastic micro packer connected to a hole formed in a crack to inject repairing solution into the crack of a concrete structure, the plastic micro packer comprising: 
 a hollow rubber sleeve inserted into the hole, the rubber sleeve having a screw portion formed on the inner surface thereof;    a hollow packer body having a screw coupling portion screwed with the screw portion and a nozzle portion connected to a repairing solution injector; and    a cover member connected to the nozzle portion to prevent leakage of repairing solution.    
   
   
       2 . The plastic micro packer according to  claim 1 , wherein the screw portion of the rubber sleeve has a wide top and a narrow bottom.  
   
   
       3 . The plastic micro packer according to  claim 1 , wherein a wrench coupling portion is formed on the circumference of the center of the packer body to screw the packer body to the rubber sleeve using a tool, such as a wrench.  
   
   
       4 . The plastic micro packer according to  claim 1 , wherein the cover member includes a stopper connected to the nozzle portion, a round connection ring coupled to the screw coupling portion loosely, and a flexible connection cord for connecting the stopper and the connection ring to each other.  
   
   
       5 . A method for repairing middle or low pressure cracks using a plastic micro packer, the method comprising the steps of: 
 forming a number of first holes in cracks of a concrete structure in uniform diameter and depth and at uniform intervals;    additionally forming deeper holes in the first holes using a core drill having a hollow-type core bit to form a concrete core portion, which passes cracks, on the bottom surface of the hole;    cutting the concrete core portion attached inside each hole by applying impact to the concrete core portion;    cleaning pulverized concrete powder or dust along the holes and cracks;    connecting a hollow rubber sleeve to the inner surface of the hole, the hollow rubber sleeve having a screw portion;    connecting a hollow packer body to the rubber sleeve, the hollow packer body having a screw coupling portion screwed to the screw portion of the rubber sleeve and a nozzle portion connected to a repairing solution injector;    injecting the repairing solution into the crack through the nozzle portion;    stopping the nozzle portion with a cover member after the injection of the repairing solution; and    cutting and finishing the packer body and the rubber sleeve protruding from the surface of the concrete structure after the injected repairing solution is hardened.    
   
   
       6 . The method according to  claim 5 , further comprising the steps of: 
 mounting check windows communicating with the cracks between the holes after the connection of the packer body to the rubber sleeve, the check window having a repairing solution space; and    seating the cracks along the cracks between the check windows and the holes to prevent leakage of the repairing solution.    
   
   
       7 . The method according to  claim 6 , wherein in the sealing step, a sealing tape is adhered along the cracks.  
   
   
       8 . The method according to  claim 6 , in the sealing step, the cracks are sealed with epoxy resin.