Packing apparatus for pressure type soil-nailing and soil-nailing construction method using the packing apparatus

Abstract

The present invention relates to a packing apparatus for pressure type soil-nailing and soil-nailing construction method using the apparatus, can shorten a grouting time through pressure type grouting which seals completely grouting area, and can improve stability of a ground reinforcing body by filling liquid grout to even a gap between a boring hole and the ground and void of the ground.

What is claim is:  
     
         1 . In a packing apparatus for sealing a grouting area by being inserted at a hole that is bored on an dug surface, the packing apparatus for pressure type soil-nailing comprising; 
 a nail;    a first packing and a second packing that are fitted at a predetermined interval mutually to the lengthwise direction of said nail;    a non-woven fabric for sealing space between the first packing and the second packing by providing to wrap the circumferential surface of said first packing and second packing;    a first grouting pipe for injecting liquid grout in said grouting area, the first grouting pipe pierces said first packing and second packing but one end of the pipe is established in a position near from one end of said nail;    a discharging pipe of air and foreign material for discharging air and foreign material of a grouting area by said grouting, the discharging pipe of air and foreign material pierces said first packing and second packing but one end of the pipe is established in a position near from said second packing; and    a foaming urethane injection pipe for injecting a foaming urethane of which bulk is expanded by being gel at space that is sealed by said non-woven fabric, the foaming urethane injection pipe pierces said first packing but one end of the pipe is established at space between said first packing and second packing.    
     
     
         2 . The packing apparatus according to  claim 1 , further comprising a second grouting pipe for injecting liquid grout into said grouting area by piercing said first packing and second packing but establishing the end thereof at a position near from said second packing.  
     
     
         3 . The packing apparatus according to  claim 1 , further comprising wire rings for combining closely said non-woven fabric on the circumferential surface of said first and second packing by screwing, said wire rings are established at outside of said non-woven fabric along the circumferential surface of said first and second packing in order to combine said first, second packing and said non-woven fabric.  
     
     
         4 . The packing apparatus according to  claim 1 , wherein said first and second packing are a rubber material.  
     
     
         5 . A soil-nailing construction method using a packing apparatus for pressure type soil-nailing, the method comprising, 
 digging the ground to a stable height in which slope or wall of pit digging is capable of self-support;    forming a boring hole by boring a hole of a predetermined diameter at a proper position of said dug ground;    establishing by inserting at the boring hole said packing apparatus for pressure type soil-nailing with which a nail is established;    forming isolated grouting area for injecting liquid grout by contacting closely said packing apparatus for pressure type soil-nailing at a inner diameter of the boring hole;    filling by injecting liquid grout in said grouting area;    discharging to outside air and foreign material in grouting area when liquid grout is injected in said grouting area;    sealing said grouting area by blocking a passage in which said air and foreign material are discharged; and    filling pressurizingly liquid grout in said grouting area so that liquid grout may fill up to even void and joint of the ground surrounding boring hole.    
     
     
         6 . Soil-nailing construction method according to  claim 5 , further comprising pouring liquid grout again after passing a predetermined time since completion of step to fill pressurizingly liquid grout in said grouting area.