Method for alternately constructing underground vertical members using top-down construction method

Abstract

The present invention is provided to shorten a period of underground frame construction in top-down construction method, and more specifically, provides a construction method for alternately constructing underground vertical members downward to lower levels and then constructing remaining vertical members during the same time period after mat and foundation construction, thus making it possible to shorten a construction period of the vertical members and an overall construction period. The method includes a first step of installing the earth retaining wall, constructing the underground pillar post, excavating the first underground level, and constructing the first above-ground level floor; a second step of first constructing the core part of one underground level while constructing the underground level slab downward to support the above-ground level core part which is constructed upward; a third step of alternately constructing an underground vertical member downward; and a step of constructing remaining underground vertical members during the same time period after the construction of the lowest level mat or the foundation, in which the construction period of the underground vertical member is shortened, and thereby the above-ground frame and finishing construction can be started early and an overall construction period is shortened.

1 . A construction period shortening method through a method for alternately constructing underground vertical members in construction of underground vertical members of a building in which an above-ground frame is constructed upward in parallel with construction of an underground structure downward, comprising:
 a first step of excavating and constructing an underground level slab downward;   a second step of alternately pre-constructing an underground vertical member; and   a third step of constructing remaining underground vertical members alternately, during the same time period, or in 2 times after the construction of the second step,   wherein the construction is alternately carried out.   
     
     
         2 . The construction period shortening method through a method for alternately constructing underground vertical members according to  claim 1 ,
 wherein when the underground level is a 6th underground level,   first underground level, 3rd underground level, and 5th underground level core parts are alternately pre-constructed while constructing the underground slab downward, and then 6th underground level, 4th underground level, and 2nd underground level core parts are constructed during the same time period.   
     
     
         3 . The construction period shortening method through a method for alternately constructing underground vertical members according to  claim 1 ,
 wherein when the underground level is a 5th underground level,   first underground level and 3rd underground level core parts are alternately pre-constructed while constructing the underground slab downward, and then the 5th underground level core part is constructed, the 4th underground level core part is constructed, and the second underground level core part is constructed during a construction period of the 5th underground level and the 4th underground level.   
     
     
         4 . The construction period shortening method through a method for alternately constructing underground vertical members according to  claim 1 ,
 wherein when the underground level is a 4th underground level,   first underground level and 3rd underground level core parts are alternately pre-constructed while constructing the underground slab downward, and then the 4th underground level and second underground level core parts are constructed during the same time period.   
     
     
         5 . The construction period shortening method through a method for alternately constructing underground vertical members according to  claim 1 ,
 wherein when 2 levels of the lowest level of the underground levels and an upper level thereof are simultaneously excavated,   the core parts are alternately pre-constructed while constructing the underground slab downward, the mat or the foundation is constructed, the lowest level core part and an upper level slab thereof are constructed, and then the remaining core parts are constructed during the same time period.   
     
     
         6 . The construction period shortening method through a method for alternately constructing underground vertical members according to any one of  claims 1  to  5 ,
 wherein the core parts, which are alternately pre-constructed, and the remaining core parts, which are constructed thereafter during the same time period, are constructed by dividing into preceding and subsequent based on the mat excavation work. 
 
     
     
         7 . The construction period shortening method through a method for alternately constructing underground vertical members according to any one of  claims 1  to  5 ,
 wherein a construction schedule of each of the core parts, which are alternately pre-constructed, is in a range between an earliest possible start date (early start date) which starts after the completion of the corresponding level slab and the latest completion date (late finish date) which is completed before a time point when the remaining core parts are constructed subsequent. 
 
     
     
         8 . The construction period shortening method through a method for alternately constructing underground vertical members according to any one of  claims 1  to  5 ,
 wherein the underground vertical member includes a core part or a pillar connected to an above-ground level. 
 
     
     
         9 . The construction period shortening method through a method for alternately constructing underground vertical members according to  claim 1 ,
 wherein in the alternately constructed underground vertical members, the core part or the pillar of the odd-numbered (or even-numbered) underground level is pre-constructed while constructing the underground slab downward, the mat or the foundation is constructed, and then the core part or the vertical member of the pillar of the even-numbered (or odd-numbered) level, which is the remaining level, is constructed at once or twice depending on site conditions.   
     
     
         10 . The construction period shortening method through a method for alternately constructing underground vertical members according to  claim 1 ,
 wherein the construction of the remaining core parts subsequent and at once further includes a method for placing concrete, which is a subsequent process, at the same period after installing a reinforcing bar of the remaining underground core part as early as possible.   
     
     
         11 . A construction period shortening method through a method for alternately constructing underground vertical members, comprising:
 (a) a step of constructing a temporary earth retaining wall in a ground by a conventional method;   (b) a step of vertically installing an above-ground level core part and pillar, from above ground, which is constructed upward in parallel with construction of a underground structure downward when the underground structure and the above-ground structure are constructed;   (c) a step of excavating the first above-ground level, constructing a floor part thereof, excavating the first underground level, and then constructing a floor part thereof;   (d) a step of excavating each of the remaining underground levels in order in a downward direction and constructing the floor part, and simultaneously constructing core parts of one underground level or a plurality of underground levels first to support the above-ground level core part which is preferentially constructed upward;   (e) a step of preferentially constructing the above-ground level core part in an upward direction on an upper part of the underground level core part which is constructed first, and installing the underground level frame in the downward direction in parallel therewith;   (f) a step of alternately installing the core parts after the core part of one underground level is installed first in the step of installing the underground level frame in the downward direction;   (g) a step of forming the foundation after the underground level frame is completed to the foundation, and installing the core parts of the remaining levels to be alternately constructed downward in the upward direction from the lowest level to the underground level core part which is constructed first, during the same time period or sequentially; and   (h) a step of constructing the construction completion through the remaining frame construction of the above-ground level and the final construction that is finishing work,   wherein the underground core parts are constructed first or during the same time period within a certain possible range to exclude them from a main process line critical path to shorten an overall construction period.   
     
     
         12 . The construction period shortening method through a method for alternately constructing underground vertical members according to  claim 11 ,
 wherein the step of alternately installing the core parts includes constructing the odd-numbered level core part, the remaining level core parts include the even-numbered level core parts, the odd-numbered level and even-numbered level core parts are converted based on the mat construction, and the lowest level core part and the upper level core part thereof are sequentially constructed depending on site features.