KR102301605B1 - A Method of Bottom-up Removal of Underground Structures - Google Patents

Abstract

The present invention relates to a method for removing an underground structure upward, which is capable of using a prefabricated temporary wall without using a temporary structure, and safely and rapidly removing the underground structure from the lowest floor to the ground floor. More specifically, in accordance with the present invention, the method for removing the underground structure upward comprises: a first pillar installation step to install a first temporary pillar penetrating an edge part of a plurality of slabs on an underground floor; a second pillar installation step to, after the first pillar installation step, install a second temporary pillar at a certain interval from the first temporary pillar; a wall installation step to, after the second pillar installation step, install a temporary wall between the first temporary pillar and the second temporary pillar by assembling a plurality of unit prefabricated walls; a line refilling step to, after the wall installation step, perform a line refilling process with soil and sand in the part between an underground wall on the underground floor to be removed and the temporary wall; a removal step to, after the line refilling step, remove an edge part of the underground wall and the slabs; and an elimination step to, after the removal step, eliminate the temporary wall.

Description

{A Method of Bottom-up Removal of Underground Structures}

The present invention relates to a bottom-up demolition method of an underground structure that can safely and quickly demolish an underground structure from the lowest floor to the above-ground floor by using a prefabricated temporary wall without using a temporary structure.

The bottom-up underground retaining wall removal method using the H file for retaining the existing building disclosed in Korean Patent Publication No. 10-1410471 is a conventional building used outside the underground retaining wall 90 to be demolished as shown in FIG. In case the retaining method is the CIP method using the H pile 92 or the earth plate construction method, a plurality of steel aggregate wales 94 and struts 96 in the horizontal direction between the underground retaining walls in the underground space surrounded by the underground retaining wall 90 ) and supporting the underground retaining wall 90 in the horizontal direction, the process of demolition of the underground internal structure is sequentially carried out from the uppermost basement level to the lowest basement level, and the topdown underground structure demolition and strut installation process (first process) and During the first process or after the first process is completed, a hole 98 is drilled so that the underground retaining wall 90 is drilled at a predetermined position on the vertical line where the H pile 92 is located, and the hole 98 is drilled. A retaining wall anchor beam mounting process (second process) of coupling the retaining wall anchor beams 100 to the H pile 92 exposed through the However, if the CIP earth wall 102 is present on the outside of the underground retaining wall 90, the CIP earth wall 102 is also partially cut from the lower side by a predetermined height and lifted together. The process (the third process) and the bottom-up sequential removal of the underground retaining wall and the sequential reclamation process (the fourth process) and the fourth process in which the third process is divided and sequentially repeated several times up to the uppermost basement level Thereafter, it was characterized in that the H-pillar 92 was pulled out and removed, and a drawing-removing process (fifth process) was included.

In this method of removing the underground retaining wall, the vertical load (self-weight) of the underground retaining wall 90 is supported through the retaining wall support anchor beam 100 that is combined with the existing building retaining retaining H pile 92, and the underground retaining wall 90 H-pillars 92 for retaining existing buildings or CIP earth walls 102 do not exist because they had to be supported with temporary structures such as steel aggregate wale 94 and struts 96 that cross the underground space. Not only is it inapplicable to buildings that have not been built, but there are also problems such as the construction cost and time required for the installation of the temporary structure, difficulty in securing a working space, and a high risk of safety accidents.

In addition, since the underground retaining wall 90 and the CIP earth wall 102 are partially cut from the lower side, there is a problem that there is a great risk of a safety accident.

And, the composite construction method of simultaneously proceeding with the demolition and new construction of an underground structure disclosed in Republic of Korea Patent Publication No. 10-1205783 is a retaining wall for the construction of a new underground structure to support the horizontal framing member of the existing underground structure. Installing a support means and filling the periphery of the retaining wall to secure a loading and working space for construction equipment, installing a temporary retaining wall on the rear surface of the retaining wall and supporting it with a raker, The steps of crushing the framing part of the existing underground structure that interferes with the position of the retaining wall, such as the retaining wall, and removing the temporary retaining wall after refilling the periphery of the temporary retaining wall while dismantling the raker; and constructing the retaining wall It was characterized in that it was constructed including the step of removing the filled soil again after doing so.

In this composite construction method, the retaining wall can be constructed so that it becomes a combined wall with the existing underground outer wall, and the existing underground outer wall can be used as the underground outer wall of a new underground structure. The structure of the retaining wall using the H file and the earth plate inserted and laminated thereto has been disclosed, which can allow the underground outer wall and retaining wall to move together as one. Because it has to be completely constructed, the construction period and cost are high, there are many concerns about safety accidents, and there were problems that it could not be applied to the site where the existing underground structures had to be completely removed and a new underground structure had to be constructed.

And, the bottom-up sequential removal and sequential reclamation method for removing the underground retaining wall disclosed in Korean Patent Application Laid-Open No. 10-2006-0103309 is performed from the inside of the retaining wall while supporting the underground retaining wall to be removed with a predetermined support structure. By using a wheel saw cutter, etc., it was removed from the lower end, and at the same time as it came up, the process of backfilling the soil to the height to be removed was repeatedly performed.

That is, in the bottom-up sequential removal and sequential reclamation method, the underground retaining wall is gradually removed from the lower end and at the same time backfilling is performed sequentially by the height at which it is sequentially removed. Since it was necessary to use a raker-like structure that had to be installed at an angle between the inner raker pile and the raker pile and the underground retaining wall, it took a lot of construction cost and time, it was difficult to secure a work space, and the underground retaining wall was removed from the lower part. Since backfilling is done as much as the removed part afterward, there was a big problem of safety accidents due to the load and earth pressure applied from the front upper part of the removed underground retaining wall.

In addition, since the embankment reinforcement structure disclosed in Japanese Patent Application Laid-Open No. 2002-339363 is a fixed structure for semi-permanently reinforcing the filled site, it cannot be applied to the site of demolition of underground structures that require repeated construction and dismantling. There was no problem.

KR 10-1410471 B1 (June 16, 2014) KR 10-1205783 B1 (November 22, 2012) KR 10-2006-0103309 A (September 28, 2006) JP 10-2012-0104798 (December 09, 2016)

The present invention relates to a bottom-up demolition method of an underground structure that can safely and quickly demolish an underground structure from the lowest floor to the above-ground floor by using a prefabricated temporary wall without using a temporary structure.

In order to solve the problems of the prior inventions, the present invention is a method of bottom-up demolition of an underground structure, in which a first temporary column 20 penetrating the edge portion 18 of a plurality of slabs 16 in the basement is installed. A first pillar installation step (S1100); after the first pillar installation step (S1100), a second pillar installation step (S1200) of installing a second temporary pillar 22 at a predetermined interval from the first temporary pillar 20; After the second pillar installation step (S1200), a plurality of unit assembly walls 30 are assembled between the first temporary pillar 20 and the second temporary pillar 22 to install the temporary wall 25. installation step (S1300); After the wall installation step (S1300), a pre-backfill step (S1400) of backfilling the soil 32 between the underground wall 14 and the temporary wall 25 of the basement to be demolished; After the backfilling step (S1400), a demolition step (S1500) of demolishing the edge portion 18 of the underground wall 14 and the slab 16; After the demolition step (S1500), the removal step (S1600) of removing the temporary wall 25; consists of a configuration including a.

The present invention is an invention for a bottom-up demolition method of an underground structure, the first pillar installation step (S1100) presented above; a second pillar installation step (S1200); wall installation step (S1300); Backfilling step (S1400); demolition step (S1500); Before the wall installation step (S1300) in the invention consisting of a removing step (S1600); an opening forming step (S1210) of cutting a portion except for the edge portion 18 of the slab 16 to form an opening 24; add

The present invention is an invention for a bottom-up demolition method of an underground structure, the first pillar installation step (S1100) presented above; a second pillar installation step (S1200); wall installation step (S1300); Backfilling step (S1400); demolition step (S1500); In the invention consisting of a removing step (S1600); during the wall installation step (S1300), the temporary wall 25 is erected to form a “T” shape with the underground wall 14; is added.

The present invention is an invention for a bottom-up demolition method of an underground structure, the first pillar installation step (S1100) presented above; a second pillar installation step (S1200); wall installation step (S1300); Backfilling step (S1400); demolition step (S1500); Removal step (S1600) to the invention consisting of; during the demolition step (S1500), from the upper part of the underground wall 14 to the upper part of the pre-backfilled earth and sand 32 to be demolished downwardly toward the bottom; is added.

The present invention is an invention for a bottom-up demolition method of an underground structure, the first pillar installation step (S1100) presented above; a second pillar installation step (S1200); wall installation step (S1300); Backfilling step (S1400); demolition step (S1500); In the invention consisting of a removal step (S1600); during the removal step (S1500), a complete backfill step (S1510) of completely backfilling the interior of the basement from which the basement wall 14 has been removed with soil 34; After the complete backfilling step (S1510), the slab removal step (S1520) of removing the edge portion 18 of the slab 16; is added.

The present invention is an invention for a bottom-up demolition method of an underground structure, the first pillar installation step (S1100) presented above; a second pillar installation step (S1200); wall installation step (S1300); Backfilling step (S1400); demolition step (S1500); After the removal step (S1600) in the invention consisting of a removal step (S1600); remove the edge portion 18 of the underground wall 14 and the slab 16 respectively formed in a plurality of upper layers, and then the second A pillar removing step (S1610) of removing the temporary pillar 22; is added.

The present invention provides a prefabricated temporary wall between the first and second temporary columns penetrating the slab edge of the basement floors before removing the basement wall to form a “T” shape when viewed from the basement wall and the slab. It has the advantage of being able to secure a wide opening except for the edge, so that various equipment and materials can be safely and smoothly put in, and the construction can be carried out more efficiently.

And the prefabricated temporary walls installed between the first and second temporary columns respond to the back earth pressure and the load acting on the underground wall to be demolished in a distributed manner, and between the underground wall and the prefabricated temporary walls before removing the underground wall. Since the wall parts of the underground wall partitioned by the prefabricated temporary walls are alternately removed in the state of being backfilled with soil, but removed from the top without line backfill to the bottom with line backfill, it is removed more safely and quickly. It has the advantage of being able to remove

In addition, the present invention provides a back earth pressure acting on an underground wall without crossing an underground space such as a horizontal strut, a steel aggregate wale, a raker pile, a raker, etc. or using a temporary structure with a large occupied space, which has been essentially used by the prior art The prefabricated temporary wall installed between the slab edge and the first and second temporary columns between the opening and the underground wall to be demolished will exert sufficient stress for the overload, making the demolition work of the underground wall safer, faster and cheaper. There are advantages to implementing it.

1 is a perspective view showing a state in which an opening is formed in the slab of the present invention and a first temporary pillar is installed.
Figure 2 is a perspective view illustrating a state in which the temporary walls of the present invention are erected.
3A, 3B, and 3C are plan views illustrating a construction example of a first temporary column and a second temporary column on which the temporary walls of the present invention are erected.
Figure 4 is a longitudinal cross-sectional view illustrating a case in which the temporary wall of the present invention is erected.
Figure 5 is a perspective view showing a backfilling state between the underground wall and the temporary wall of the present invention.
FIG. 6 is an enlarged longitudinal cross-sectional view showing the line backfilling shown in FIG. 5; FIG.
7 is an enlarged longitudinal cross-sectional view showing a state in which the upper part of the basement wall of the present invention is removed.
8 is a flowchart showing a bottom-up demolition method of an underground structure of the present invention.
9 is a longitudinal cross-sectional view showing a construction example of the bottom-up demolition method of the underground structure of the present invention of the present invention.
10 is a longitudinal cross-sectional view showing a construction example of the prior art.

Hereinafter, the most preferred embodiment of the present invention will be described in detail in order to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily carry out the present invention.

The numbers cited in the examples below are not limited only to the objects of reference, and may be applied to all examples. Objects exhibiting the same purpose and effect as the configuration presented in the examples correspond to equivalent replacement objects. The higher-level concept presented in the examples includes sub-concept objects that are not described.

(Example 1-1) In the present invention, in the bottom-up demolition method of an underground structure, a first pillar for installing a first temporary pillar 20 penetrating the edge portion 18 of a plurality of slabs 16 in the basement floor installation step (S1100); after the first pillar installation step (S1100), a second pillar installation step (S1200) of installing a second temporary pillar 22 at a predetermined interval from the first temporary pillar 20; After the second pillar installation step (S1200), a plurality of unit assembly walls 30 are assembled between the first temporary pillar 20 and the second temporary pillar 22 to install the temporary wall 25. installation step (S1300); After the wall installation step (S1300), a pre-backfill step (S1400) of backfilling the soil 32 between the underground wall 14 and the temporary wall 25 of the basement to be demolished; After the backfilling step (S1400), a demolition step (S1500) of demolishing the edge portion 18 of the underground wall 14 and the slab 16; After the demolition step (S1500), the removal step (S1600) of removing the temporary wall 25; includes.

(Example 1-2) The bottom-up demolition method of the underground structure of the present invention is the method of Example 1-1, wherein the first temporary pillar 20 is the underground wall 14 and the slab 16 edge 18 is installed at a location in contact with;

(Example 1-3) In the bottom-up demolition method of the underground structure of the present invention, in Example 1-2, the first temporary pillar 20 is adjacent to the underground wall 14 and installed in parallel; include

(Example 1-4) In the bottom-up demolition method of the underground structure of the present invention, in Example 1-1, the second temporary column 22 is spaced apart from the edge portion 18 of the slab 16. Included;

The present invention relates to a bottom-up demolition method of an underground structure. Specifically, the bottom-up demolition method of the underground structure is to use the prefabricated temporary wall 25 to remove the basement wall 14 and the slab 16 while ascending from the lowermost floor to the uppermost floor. The bottom-up demolition method of this underground structure is to be demolished by using a prefabricated temporary wall that is assembled in a form in which the edge portion 18 of the slab 16 and the unit wall on each floor of the underground structure 10 to be demolished are laminated. 14) Safer and faster demolition work of the underground structure 10 without using temporary structures that cross the underground space such as horizontal struts, steel aggregate wales, raker piles, rakers, etc. And it can be done cheaply.

In detail, as the foundation floor 12 of the demolished underground structure 10 is removed and the removal process of the basement wall 14 and the soil backfill process are repeatedly performed, the underground structure 10 is moved from the lowest floor to the uppermost floor. demolition from the bottom up. To this end, the first pillar installation step (S1100) of installing the first temporary pillar 20 through the edge portion 18 of the plurality of slabs 16 of the basement is formed. At this time, the first temporary column 20 is a first drilling hole 26 formed by drilling a position where the underground wall 14 and the edge 18 of the slab 16 contact each other as shown in FIGS. 3A to 3C . It is preferable to install in parallel with the basement wall 14 as close as possible to the basement wall 14 as it penetrates and is inserted into the bottom floor, as it can exert the stress corresponding to the back earth pressure and the load acting on the basement wall 14.

And after the first pillar installation step (S1100), a second pillar installation step (S1200) of installing the second temporary pillar 22 and the first temporary pillar 20 at a predetermined interval is formed. The second temporary pillar 22 in the second pillar installation step (S1200) is poured directly on the bottom of the lowest floor in a state spaced apart from the edge portion 18 of the slab 16, as illustrated in FIG. 3A, or as shown in FIG. 3B and FIG. As exemplified in 3c, in the same manner as in the first temporary pillar 20, the second provisional pillar is poured through the second bore hole 28 punched in the edge portion 18 of the sleeve 16 to be inserted into the lowest floor. (22) can be installed more firmly and used.

And in the wall installation step (S1300) of installing the temporary wall 25, the temporary wall 25 is formed between the first temporary pillar 20 and the second temporary pillar 22, and the temporary wall 25 is installed and a plurality of unit assembly walls 30 stacked on each other to facilitate disassembly. In this case, the unit assembly wall 30 may be formed of various materials such as metal, wood, and concrete blocks to support a load.

After the temporary wall 25 is installed, a pre-backfill step (S1400) of backfilling the earth and sand 32 between the underground wall 14 and the temporary wall 25 of the basement floor to be demolished is formed. At this time, the soil 32 is backfilled so that the basement wall 14 is laminated to the rear side, and is backfilled between the plurality of temporary walls 25 . This is because the back-filled soil 32, which is lined toward the underground wall 14 and the temporary wall 25, exerts a complex stress sufficient to respond to the load and the back tower acting on the underground wall 14 to be demolished. It can be applied without relying on retaining wall anchor beams and horizontal struts even at sites where there is no H-pillar or CIP earth wall for retaining existing buildings on the front of the underground wall 14 to be demolished, and the basement wall 14 to be demolished can be applied. Demolition work can be carried out safer, faster and cheaper without supporting it with raker piles and rakers in advance. The soil 32 formed by such line backfilling is to backfill only a part, not the whole, of the underground wall 14, and only a certain height is backfilled, and the underground wall 14 is the part that is not backfilled in the demolition step (S1500). will be demolished And the line backfilling of the underground wall 14 part is to remove the line backfilling soil 32 for each underground wall part, and to remove the underground wall 14 covered by the soil 32 .

After the basement wall 14 is removed in the demolition step (S1500), the floor is completely backfilled with the soil 34 to remove the temporary wall 25 in the removal step (S1600). As such, when the ground is formed by the earth and sand 34 after the basement wall 14 of the lowermost layer of the basement is removed, the upper layer of the lowermost layer is sequentially removed from the basement wall 14 in the same manner.

Therefore, in the bottom-up demolition method of the underground structure of the present invention, the first temporary column 20, the second temporary column 22, and the temporary wall 25 are installed in order to remove the underground wall 14 of the underground floor due to the iron system. It is to backfill the earth and sand 32, and has the characteristic that the basement wall 14 and the slab 16 can be removed sequentially from the lowest floor to the upper floor.

(Example 2-1) The present invention relates to a bottom-up demolition method of an underground structure, and in Example 1-1, before the wall installation step (S1300), the edge portion 18 of the slab 16 is excluded. and an opening forming step (S1210) of forming an opening 24 by cutting a portion.

The present invention relates to the opening forming step (S1210), specifically, in order to increase the working efficiency and to smoothly bring in equipment or materials, the opening 24 is formed by cutting the portion except for the edge portion 18 of the slab 16. will do Since this opening forming step (S1210) is to form a very large opening 24 in the remaining portion except for the edge portion 18 of the sleeve 16, it crosses or occupies an underground space such as a horizontal strut, a raker pile, a raker, etc. Compared to the prior art, which required the installation of various temporary structures with large spaces, it does not impose spatial restrictions on input, import, withdrawal, or export of various equipment or materials into the underground space, as well as The construction cost and time can be greatly reduced and shortened, and sufficient work space can be secured, which greatly improves workability and effectively reduces the occurrence of safety accidents.

(Example 3-1) The present invention relates to a bottom-up demolition method of an underground structure, and in Example 2-1, during the wall installation step (S1300), the temporary wall 25 is the underground wall 14 and hypotheses to form a “T” shape;

(Example 3-2) The bottom-up demolition method of an underground structure of the present invention includes; in Example 3-1, the temporary wall 25 is formed by assembling a plurality of the unit assembly walls 30 do.

(Example 3-3) The bottom-up demolition method of an underground structure of the present invention is the method of Example 3-1, wherein the unit assembly wall 30 is formed of one selected from among hexagonal, semi-hexagonal, square, and triangular. do.

(Embodiment 3-4) The bottom-up demolition method of an underground structure of the present invention according to Embodiment 3-1, wherein the unit assembly walls 30 are assembling protrusions 30a formed on one surface to be assembled with each other.

(Example 3-5) In Example 3-4, the bottom-up demolition method of the underground structure of the present invention comprises: an assembly hole formed on the other surface of the unit assembly wall 30 and into which the assembly protrusion 30a is inserted; includes

The present invention relates to a temporary wall 25, and specifically, it is formed between the first temporary pillar 20 and the second temporary pillar 22, and it is possible to reinforce the pressure of the soil 32 to be backfilled. . The temporary wall 25 is formed by a unit assembly wall 30 that is laminated to facilitate installation and dismantling between the first and second temporary columns 20 and 22 adjacent to the underground wall 14 to be demolished. do. At this time, the unit assembly wall 30 is formed of a polyhedron such as a hexagon, a semi-hexagonal, a square, and a triangle, and is inserted between the flanges formed on the first temporary pillar 20 and the second temporary pillar 22 or a separate rail. is stacked by And the unit assembly wall 30 is formed of various materials such as wood, concrete block, synthetic resin, and metal as shown in FIG. When the assembly groove 30b is formed and a plurality of unit assembly walls 30 are assembled, the assembly projection 30a is inserted into the assembly groove 30b of the other unit assembly wall 30 to be formed.

Therefore, in the temporary wall 25 of the present invention, a unit assembly wall 30 is formed between the first temporary pillar 20 and the second temporary pillar 22 so that it can be easily installed and disassembled. The wall 30 is characterized in that it is formed as a polyhedron.

(Example 4-1) The present invention relates to a bottom-up demolition method of an underground structure. In Example 3-1, during the demolition step (S1500), the soil backfilled from the upper part of the underground wall 14 ( 32) to the top of the top to the bottom to top down to demolish; includes.

(Example 4-2) In the bottom-up demolition method of the underground structure of the present invention, in Example 4-1, the earth and sand 32 is removed after the upper part of the underground wall 14 is removed to remove the Demolition of the lower part; includes.

The present invention relates to the demolition step (S1500), and specifically, the demolition step (S1500) is to remove the underground wall 14 up to the upper surface of the backfilling soil 32. In this demolition step (S1500), the basement wall 14 is sequentially removed from the lowest floor to the top floor of the basement floor to be demolished, but in each floor, the basement wall 14 is removed from the upper part to the upper part of the soil 32 downward toward the bottom. will become This is to prevent the soil collapse formed on the inside of the underground wall 14 by the soil 32 .

After the underground wall 14 is removed in a top-down manner, the soil 32 is removed in order to dismantle the underground wall 14 formed on the backside of the backfilling soil 32 .

(Example 5-1) The present invention relates to a bottom-up demolition method of an underground structure, and in Example 4-1, during the demolition step (S1500), the interior of the basement from which the underground wall 14 is removed is soiled a complete backfill step of completely backfilling with (34) (S1510); After the complete backfilling step (S1510), the slab removal step (S1520) of removing the edge portion 18 of the slab 16; includes.

(Example 5-2) In the bottom-up demolition method of an underground structure of the present invention, in Example 5-1, the complete backfilling step (S1510) includes a plurality of the temporary walls 25 from which the underground walls 14 are removed. Backfilling the soil 34 between each; includes.

(Example 5-3) In the bottom-up demolition method of an underground structure of the present invention, in Example 5-1, the complete backfilling step (S1510) is to remove the soil 34 to a position in contact with the lower surface of the slab 16. backfilling; includes.

The present invention relates to the demolition step (S1500), and specifically, the underground walls 14 are safely removed alternately, and the location where the underground walls 14 are removed is to completely backfill the soil 34. In this demolition step (S1500), a complete backfill step (S1510) of completely backfilling the soil 34 between the plurality of temporary walls 25 from which the underground wall 14 has been removed is formed. At this time, the soil 34 is to be backfilled to a position in contact with the lower surface of the slab 16, which is to support the load of the upper part. In addition, it is also possible to install earth plates 36 such as retaining boards between the first temporary pillars 20 while completely backfilling, thereby forming a retaining wall, which can be used for new construction of a building, which is a post-process.

In this way, when the complete backfilling of the basement from which the basement wall 14 is removed is completed, the slab demolition step (S1520) of removing the slab 16 of the upper layer is formed. At this time, the slab 16 is to remove the edge portion 18 because only the edge portion 18 remains in the opening forming step (S1210).

(Example 6-1) The present invention relates to a bottom-up demolition method of an underground structure, and in Example 4-1, after the removing step (S1600), the underground walls 14 and and a pillar removal step (S1610) of removing the edge portion 18 of the slab 16 and then removing the second temporary pillar 22.

The present invention relates to the removal step (S1600), and specifically, when the edge portion 18 of the lowermost basement wall 14 and the slab 16 is removed, the upper floor basement wall 14 and the slab 16 are completely backfilled. ) is removed in the same way. This removal step (S1600) is to remove the second temporary pillar 22 when the backfill is completed by removing the edge portion 18 of the basement wall 14 and the slab 16 sequentially from the lowest floor to the uppermost floor. At this time, since the first temporary pillar 20 can be used as a retainer, etc., it can be removed and maintained according to site conditions and processes.

10: underground structure 12: foundation floor of the building
14: basement wall 16: slab
18: the edge of the slab 20: the first temporary column
22: second temporary column 24: opening
25: temporary wall 26: first perforated hole
28: second perforated hole 30: unit assembly wall
30a: assembly protrusion 30b: assembly groove
32: soil backfilling line 34: soil backfilling completely
36: earth plate
S1100: first pillar installation step S1200: second pillar installation step
S1210: opening forming step S1300: wall installation step
S1400: Backfilling step S1500: Demolition step
S1510: Complete backfill step S1520: Slab removal step
S1600: removal step S1610: pillar removal step

Claims (6)

In the bottom-up demolition method of an underground structure,
A first pillar installation step (S1100) of installing a first temporary pillar 20 penetrating the edge portion 18 of the plurality of slabs 16 in the basement;
After the first pillar installation step (S1100), a second pillar installation step (S1200) of installing a second temporary pillar 22 and the first temporary pillar 20 and a predetermined interval;
After the second pillar installation step (S1200), a plurality of unit assembly walls 30 are assembled between the first temporary pillar 20 and the second temporary pillar 22 to install the temporary wall 25. installation step (S1300);
After the wall installation step (S1300), a pre-backfill step (S1400) of backfilling the soil 32 between the underground wall 14 and the temporary wall 25 of the basement floor to be demolished;
After the backfilling step (S1400), the demolition step (S1500) of demolishing the edge portion (18) of the underground wall (14) and the slab (16);
After the demolition step (S1500), a removal step of removing the temporary wall 25 (S1600); a bottom-up demolition construction method of an underground structure comprising a.
The method according to claim 1,
Before the wall installation step (S1300), an opening forming step (S1210) of forming an opening 24 by cutting from the center of the slab 16 to the end of the edge portion 18; .
The method according to claim 1,
During the wall installation step (S1300), the temporary wall 25 is erected to form a “T” shape with the underground wall 14;
The method according to claim 1,
During the demolition step (S1500), top-down demolition from the upper part of the underground wall 14 to the upper part of the line backfilled soil 32 toward the bottom.
5. The method according to claim 4,
During the demolition step (S1500), a complete backfill step (S1510) of completely backfilling the interior of the basement from which the basement wall 14 has been removed with soil 34;
After the complete backfilling step (S1510), the slab demolition step (S1520) of demolishing the edge portion 18 of the slab 16; bottom-up demolition construction method of an underground structure comprising a.
The method according to claim 1,
After the removal step (S1600), removing the edge portions 18 of the underground walls 14 and the slabs 16 respectively formed on the plurality of upper layers, and then removing the second temporary pillars 22. Step (S1610); a bottom-up demolition method of an underground structure comprising a.

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