Underground-structure construction method

Abstract

An underground-structure construction method of arranging an underground structure by causing drilling apparatuses engaged with a concrete-made closed-shaped bottom frame to travel in a reciprocating manner to drill a just-underground of a bottom part of the underground structure, discharging to an earth surface excavated earth and sand of an internal ground, and extending a building frame of an upper part of the underground structure includes: open-cutting a ground to form a larger-sized mortar-shaped working hole; forming a closed-shaped horizontal reference area in an edge ground; arranging a bottom frame on the horizontal reference area; building a first stage building frame on the bottom frame; and backfilling, with backfill soil, an annular-shaped outer space of inner and outer spaces as a result of dividing the working hole, the drilling apparatuses being caused to uniformly drill, from the horizontal reference area as a drilling initiation plane, the just-underground of the bottom part.

What is claimed is: 
     
         1 . An underground-structure construction method of arranging underground an underground structure by: causing a plurality of drilling apparatuses, which are reciprocatably engaged with a bottom frame of closed shape made of concrete of the underground structure, to travel in a reciprocating manner so as to drill a just-underground of a bottom part of the underground structure; discharging, to an earth surface, excavated earth and sand of an internal ground on an internal side of the underground structure; and extending a building frame of an upper part of the underground structure, the underground-structure construction method comprising the steps of:
 open-cutting a ground so as to form a mortar-shaped working hole larger in size than the underground structure;   forming a horizontal reference area of closed shape in an edge ground of a bottom part of the working hole;   arranging a bottom frame on the horizontal reference area in the working hole so as to form the bottom frame into a closed shape;   building a first stage building frame of the underground structure on the bottom frame in the working hole; and   backfilling, with backfill soil, an annular-shaped outer space out of inner and outer spaces as a result of dividing the working hole at the underground structure, wherein   the plurality of drilling apparatuses are caused to uniformly drill, from the horizontal reference area as a drilling initiation plane, the just-underground of the bottom part of the underground structure.   
     
     
         2 . The underground-structure construction method according to  claim 1  wherein
 the bottom frame has a continuous lower flange formed thereon, and 
 a self-weight of the underground structure is supported, through an entire lower surface of the lower flange, by the just-underground of the bottom part of the underground structure. 
 
     
     
         3 . The underground-structure construction method according to  claim 1  wherein
 in parallel with causing the plurality of drilling apparatuses engaged with the bottom frame to uniformly drill the just-underground of the bottom part of the underground structure, 
 the internal ground on the internal side of the underground structure is excavated so that excavated earth of the internal ground is discharged to the earth surface. 
 
     
     
         4 . The underground-structure construction method according to  claim 1  wherein
 the plurality of drilling apparatuses engaged with the bottom frame are caused to perform a width-expansion drilling beyond a width of the building frame of the underground structure, 
 so that the underground structure is allowed to sink while a space is formed for insulation between a hole wall as a result of the width-expansion drilling and an outer wall surface of the underground structure. 
 
     
     
         5 . The underground-structure construction method according to  claim 2  wherein
 the plurality of drilling apparatuses engaged with the bottom frame are caused to perform a width-expansion drilling beyond a width of the building frame of the underground structure, 
 so that the underground structure is allowed to sink while a space is formed for insulation between a hole wall as a result of the width-expansion drilling and an outer wall surface of the underground structure. 
 
     
     
         6 . The underground-structure construction method according to  claim 3  wherein
 the plurality of drilling apparatuses engaged with the bottom frame are caused to perform a width-expansion drilling beyond a width of the building frame of the underground structure, 
 so that the underground structure is allowed to sink while a space is formed for insulation between a hole wall as a result of the width-expansion drilling and an outer wall surface of the underground structure. 
 
     
     
         7 . The underground-structure construction method according to  claim 1  wherein
 each of the plurality of drilling apparatuses includes: a self-propellable travelling body engaged with the bottom frame; and a rotary cutter arranged in the travelling body rotatably around a vertical axis, 
 so that each of the plurality of drilling apparatuses drills the just-underground of the bottom part of the underground structure through the rotary cutter's rotation and travel along the bottom frame. 
 
     
     
         8 . The underground-structure construction method according to  claim 2  wherein
 each of the plurality of drilling apparatuses includes: a self-propellable travelling body engaged with the bottom frame; and a rotary cutter arranged in the travelling body rotatably around a vertical axis, 
 so that each of the plurality of drilling apparatuses drills the just-underground of the bottom part of the underground structure through the rotary cutter's rotation and travel along the bottom frame. 
 
     
     
         9 . The underground-structure construction method according to  claim 3  wherein
 each of the plurality of drilling apparatuses includes: a self-propellable travelling body engaged with the bottom frame; and a rotary cutter arranged in the travelling body rotatably around a vertical axis, 
 so that each of the plurality of drilling apparatuses drills the just-underground of the bottom part of the underground structure through the rotary cutter's rotation and travel along the bottom frame. 
 
     
     
         10 . The underground-structure construction method according to  claim 4  wherein
 each of the plurality of drilling apparatuses includes: a self-propellable travelling body engaged with the bottom frame; and a rotary cutter arranged in the travelling body rotatably around a vertical axis, 
 so that each of the plurality of drilling apparatuses drills the just-underground of the bottom part of the underground structure through the rotary cutter's rotation and travel along the bottom frame. 
 
     
     
         11 . The underground-structure construction method according to  claim 5  wherein
 each of the plurality of drilling apparatuses includes: a self-propellable travelling body engaged with the bottom frame; and a rotary cutter arranged in the travelling body rotatably around a vertical axis, 
 so that each of the plurality of drilling apparatuses drills the just-underground of the bottom part of the underground structure through the rotary cutter's rotation and travel along the bottom frame. 
 
     
     
         12 . The underground-structure construction method according to  claim 6  wherein
 each of the plurality of drilling apparatuses includes: a self-propellable travelling body engaged with the bottom frame; and a rotary cutter arranged in the travelling body rotatably around a vertical axis, 
 so that each of the plurality of drilling apparatuses drills the just-underground of the bottom part of the underground structure through the rotary cutter's rotation and travel along the bottom frame.