Underdrain excavation apparatus

Abstract

Provided is an underdrain excavation apparatus by which, while an underdrain is excavated in the ground, a hydrophobic material and/or a water-holding material (functional material) can be filled in the underdrain executed in a smooth and reliable manner. In the underdrain excavation apparatus, a soil cutting shank 11 which is vertically held and a bullet-like underdrain borer 12 which is provided on a lower end of the soil cutting shank 11 are pulled in a horizontal direction by a bulldozer 14 to excavate an underdrain 22 in a ground 21, and a functional material supplied via a functional material transport line 13 provided in the soil cutting shank 11 and in the underdrain borer 12 is filled in the underdrain. A gas flow generator generating a gas flow by jetting a high-pressure gas supplied from a high-pressure gas generator into a tubular body is connected with the functional material transport line 13.

What is claimed is:  
     
         1 . An underdrain excavation apparatus comprising: 
 a soil cutting shank which is vertically held;    a bullet-like underdrain borer which is provided on a lower end of the soil cutting shank;    a pulling means;    said soil cutting shank and said underdrain borer being pulled in a horizontal direction by the pulling means to excavate an underdrain in the ground;    a functional material transport line provided in the soil cutting shank and in the underdrain borer, a functional material supplied via said functional material transport line being filled in the underdrain; and    a gas flow generator generating a gas flow by jetting a high-pressure gas supplied from a high-pressure gas generator into a tubular body, said gas flow generator being connected with the functional material transport line.    
     
     
         2 . An underdrain excavation apparatus comprising: 
 a soil cutting shank which is vertically held;    a bullet-like underdrain borer which is provided on a lower end of the soil cutting shank;    said soil cutting shank and said underdrain borer being pulled in a horizontal direction by the pulling means to excavate an underdrain in the ground while a supply/drain pipe is being laid in the underdrain,    a functional material transport line provided in the soil cutting shank and in the underdrain borer, a functional material supplied via said functional material transport line being filled in the space between the underdrain and the supply/drain pipe; and    a gas flow generator generating a gas flow by jetting a high-pressure gas supplied from a high-pressure gas generator into a tubular body, said gas flow generator being connected with the functional material transport line.    
     
     
         3 . The underdrain excavation apparatus according to  claim 1 , wherein said gas flow generator is a Coanda spiral flow generator which slantingly jets the high-pressure gas supplied from the high-pressure gas generator from an inner peripheral surface of the tubular body toward a central axis of the tubular body to generate a spiral gas flow along said inner peripheral surface.  
     
     
         4 . The underdrain excavation apparatus according to  claim 2 , wherein said gas flow generator is a Coanda spiral flow generator which slantingly jets the high-pressure gas supplied from the high-pressure gas generator from an inner peripheral surface of the tubular body toward a central axis of the tubular body to generate a spiral gas flow along said inner peripheral surface.  
     
     
         5 . The underdrain excavation apparatus according to  claim 1 , wherein said soil cutting shank having soil pressing members which protrude in a horizontal-stabilizer-like state on both side faces of the soil cutting shank.  
     
     
         6 . The underdrain excavation apparatus according to  claim 2 , wherein said soil cutting shank having soil pressing members which protrude in a horizontal-stabilizer-like state on both side faces of the soil cutting shank.  
     
     
         7 . The underdrain excavation apparatus according to  claim 3 , wherein said soil cutting shank having soil pressing members which protrude in a horizontal-stabilizer-like state on both side faces of the soil cutting shank.  
     
     
         8 . The underdrain excavation apparatus according to  claim 4 , wherein said soil cutting shank having soil pressing members which protrude in a horizontal-stabilizer-like state on both side faces of the soil cutting shank.  
     
     
         9 . The underdrain excavation apparatus according to  claim 1 , wherein the functional material is a hydrophobic material.  
     
     
         10 . The underdrain excavation apparatus according to  claim 2 , wherein the functional material is a hydrophobic material.  
     
     
         11 . The underdrain excavation apparatus according to  claim 3 , wherein the functional material is a hydrophobic material.  
     
     
         12 . The underdrain excavation apparatus according to  claim 4 , wherein the functional material is a hydrophobic material.  
     
     
         13 . The underdrain excavation apparatus according to  claim 5 , wherein the functional material is a hydrophobic material.  
     
     
         14 . The underdrain excavation apparatus according to  claim 6 , wherein the functional material is a hydrophobic material.  
     
     
         15 . The underdrain excavation apparatus according to  claim 7 , wherein the functional material is a hydrophobic material.  
     
     
         16 . The underdrain excavation apparatus according to  claim 8 , wherein the functional material is a hydrophobic material.  
     
     
         17 . The underdrain excavation apparatus according to  claim 1 , wherein the functional material is a water-holding material.  
     
     
         18 . The underdrain excavation apparatus according to  claim 2 , wherein the functional material is a water-holding material.  
     
     
         19 . The underdrain excavation apparatus according to  claim 3 , wherein the functional material is a water-holding material.  
     
     
         20 . The underdrain excavation apparatus according to  claim 4 , wherein the functional material is a water-holding material.  
     
     
         21 . The underdrain excavation apparatus according to  claim 5 , wherein the functional material is a water-holding material.  
     
     
         22 . The underdrain excavation apparatus according to  claim 6 , wherein the functional material is a water-holding material.  
     
     
         23 . The underdrain excavation apparatus according to  claim 7 , wherein the functional material is a water-holding material.  
     
     
         24 . The underdrain excavation apparatus according to  claim 8 , wherein the functional material is a water-holding material.  
     
     
         25 . An underdrain excavation apparatus comprising: 
 a soil cutting shank which is attachably/detachably fixed on a fixing device which is provided on a traveling device; and    a bullet-like underdrain borer provided on a lower end of the soil cutting shank;    said soil cutting shank being pulled in a horizontal direction by the traveling device to excavate an underdrain in the ground;    said fixing device being disposed on a front part and on a rear part of the traveling device.    
     
     
         26 . The underdrain excavation apparatus according to  claim 25 , wherein said underdrain borer is provided with a means for laying a supply/drain pipe in the underdrain simultaneously with excavating the underdrain by moving of the traveling device.  
     
     
         27 . The underdrain excavation apparatus according to  claim 25 , further comprising a means for filling a functional material supplied from the traveling device into the underdrain via a functional material transport line provided in the soil cutting shank and in the underdrain borer.  
     
     
         28 . The underdrain excavation apparatus according to  claim 26 , further comprising a means for filling a functional material supplied from the traveling device into the underdrain via a functional material transport line provided in the soil cutting shank and in the underdrain borer.  
     
     
         29 . The underdrain excavation apparatus according to  claim 25 , wherein the functional material is a hydrophobic material.  
     
     
         30 . The underdrain excavation apparatus according to  claim 26 , wherein the functional material is a hydrophobic material.  
     
     
         31 . The underdrain excavation apparatus according to  claim 27 , wherein the functional material is a hydrophobic material.  
     
     
         32 . The underdrain excavation apparatus according to  claim 28 , wherein the functional material is a hydrophobic material.  
     
     
         33 . The underdrain excavation apparatus according to  claim 25 , wherein the functional material is a water-holding material.  
     
     
         34 . The underdrain excavation apparatus according to  claim 26 , wherein the functional material is a water-holding material.  
     
     
         35 . The underdrain excavation apparatus according to  claim 27 , wherein the functional material is a water-holding material.  
     
     
         36 . The underdrain excavation apparatus according to  claim 28 , wherein the functional material is a water-holding material.