Reinforced self-standing earth retaining structure using an arching effect and an underground excavation construction method using the same

Abstract

In a reinforced self-standing earth retaining structure using an arching effect, a soldier pile integrally formed with a soldier pile insertion portion in a vertical direction in a flange at one end of the soldier pile in which a lagging is inserted is installed at a width B to be perpendicular to the ground. A sheet panel protruding portion is inserted in and connected to the soldier pile insertion portion. A sheet panel protruding portion is serially inserted in a sheet panel insertion portion. A compression support plate protruding portion is inserted in and coupled to the sheet panel insertion portion. A relationship between a length L of a group of serial sheet panels and the width B between two groups of serial sheet panels is 0.5≦L/B≦3.0 in a range of an internal friction angle of earth φ=10˜34° and a range of an adhesive power C=0.0˜5.0 ton/m 2 so that a back earth pressure is not applied to the front lagging due to the arching effect.

1 . A reinforced self-standing earth retaining structure using an arching effect, wherein a soldier pile integrally formed with a soldier pile insertion portion in a vertical direction in a flange at one end of the soldier pile in which a lagging is inserted is installed at a width B to be perpendicular to the ground, a sheet panel protruding portion is inserted in and connected to the soldier pile insertion portion, a sheet panel protruding portion is serially inserted in a sheet panel insertion portion, a compression support plate protruding portion is inserted in and coupled to the sheet panel insertion portion, and a relationship between a length L of a group of serial sheet panels and the width B between two groups of serial sheet panels is 0.5≦L/B≦3.0 in a range of an internal friction angle of earth φ=10˜34° and a range of an adhesive power C=0.0˜5.0 ton/m 2  so that a back earth pressure is not applied to the front lagging due to the arching effect. 
     
     
         2 . The reinforced self-standing earth retaining structure using an arching effect of  claim 1 , wherein the relationship of the length L of the continuous sheet panel and the width B between the two groups of sheet panels is 0.5≦L/B≦1.5 in the ranges of internal friction angle φ=14˜22° and the adhesive power C=0.0˜5.0 (ton/m 2 ). 
     
     
         3 . The reinforced self-standing earth retaining structure using an arching effect of  claim 1 , wherein the relationship of the length L of the continuous sheet panel and the width B between the two groups of sheet panels is 1.5≦L/B≦3.0 in the ranges of internal friction angle φ=10˜14° and the adhesive power C=0.0˜5.0 (ton/m 2 ). 
     
     
         4 . The reinforced self-standing earth retaining structure using an arching effect of  claim 1 , wherein a connection portion of the soldier pile comprises a soldier pile insertion portion or a soldier pine protruding portion, and a connection portion of the sheet panel coupled to the connection portion of the soldier pile comprises a sheet panel protruding portion or a sheet panel insertion portion. 
     
     
         5 . The reinforced self-standing earth retaining structure using an arching effect of  claim 1 , wherein a compression support plate comprises a vertical portion and a horizontal portion and a connection portion of the compression support plate comprises a compression support plate protruding portion or a compression support plate insertion portion that is integrally formed with the vertical portion. 
     
     
         6 . The reinforced self-standing earth retaining structure using an arching effect of  claim 1 , wherein the connection portion of the sheet panel is firmly fixed by using upper and lower fixing devices, wherein the upper fixing device is fixed by a coupling bolt passing through the sheet panel, an attachment pad, and a coupling plate when the attachment pad and the coupling plate are sequentially located at both sides of the connection portion of the sheet panel, the lower fixing device comprises a first cut portion and a second cut portion, an upward inclined surface and a hook step are formed at the first cut portion, and a rotation plate and a spring are formed at the second cut portion, an upper end inclined surface is formed on an upper end of the rotation plate that rotates around a hinge shaft, a lower end rotation groove is formed on a lower end of the rotation plate and a vertical insertion groove is formed on a vertical surface thereof, and the spring inserted in the spring insertion groove is connected and fixed to a spring mounting device. 
     
     
         7 . An underground excavation construction method using a reinforced self-standing earth retaining structure, the method comprising:
 (a) piling a soldier pile into the ground of a boundary surface to be excavated to have a width B and a vertical depth H that is a depth of a designed ground;   (b) inserting a sheet panel protruding portion into a soldier pile insertion portion formed at a flange of the soldier pile to be connected to each other, continuously inserting the sheet panel protruding portion into a sheet panel insertion portion, and inserting a compression support plate protruding portion into the sheet panel insertion portion to be connected to each other, under the condition that a relationship between a length L of a continuous sheet panel and a width B between the sheet panels is 0.5≦L/B≦3.0 in a range of an internal friction angle of earth φ=10˜34° and a range of an adhesive power C=0.0˜5.0 ton/m 2 ;   (c) gradually performing underground excavation from the ground to a predetermined depth h 1  and then inserting a lagging from the top end of the soldier pile;   (d) when the excavation to the predetermined depth h 1  is completed, performing further excavation to a predetermined depth h 2  and then inserting the lagging from the top end of the soldier pile; and   (e) completing the underground excavation by repeating the operations (c) and (d).   
     
     
         8 . The method of  claim 7 , wherein, in the operation (b), a relationship between the length L of the continuous sheet panel and the width B between the sheet panels is 0.5≦L/B≦1.5 in a range of the internal friction angle of earth φ=14˜22° and a range of the adhesive power C=0.0˜5.0 ton/m 2 . 
     
     
         9 . The method of  claim 7 , wherein, in the operation (b), a relationship between the length L of the continuous sheet panel and the width B between the sheet panels is 1.5≦L/B≦3.0 in a range of the internal friction angle of earth φ=10˜14° and a range of the adhesive power C=0.0˜5.0 ton/m 2 . 
     
     
         10 . The method of  claim 7 , wherein, in the operation (b), an upper fixing device is fixed by a coupling bolt passing through the sheet panel, an attachment pad, and a coupling plate when the attachment pad and the coupling plate are sequentially located at both sides of the connection portion of the sheet panel, a lower fixing device comprises a first cut portion and a second cut portion, an upward inclined surface and a hook step are formed at the first cut portion, and a rotation plate and a spring are formed at the second cut portion, an upper end inclined surface is formed on an upper end of the rotation plate that rotates around a hinge shaft, a lower end rotation groove is formed in a lower end of the rotation plate and a vertical insertion groove is formed in a vertical surface thereof, and the spring inserted in the spring insertion groove is connected and fixed to a spring mounting device.