KR101401057B1 - Method to build underground structures using the pillars and the stigma and steel beam and slab structures are formed - Google Patents

Abstract

The present invention relates to an underground structure construction method using a structure comprising columns, capitals, steel beams, and a slab, wherein the underground structure construction method is as follows: brackets are installed by measuring the accurate positions of temporary steel columns appearing after excavating the ground in which the temporary steel columns are buried at regular intervals to construct an underground structure; two of the steel beams, which are separated from each other at the regular interval at positions in which structural columns are to be positioned, are directly mounted on the brackets; and 雅�shaped connection beams are formed at the positions, in which the structural columns are to be positioned, by perpendicularly assembling another steel frame to the steel frames above. According to the present invention, the underground structure construction method for installing the steel frame of a horizontal structure as above makes installing the steel frame easy and reduces working hours for installing the steel frame so that economic feasibility can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing an underground structure using pillars,

The present invention relates to a method of constructing an underground structure, and more particularly, to a method of constructing an underground structure, in which a bracket is installed in a hypothetical steel column embedded at a predetermined interval in the ground to construct an underground structure, The present invention relates to a method for constructing an underground structure using a structure formed by a column, a column, a steel frame, and a slab, which can be easily installed by installing a steel underground structure having a lattice shape, .

Generally, in the construction method of the main underground structure, the earth retaining wall is installed along the excavation planning line and the excavation is completed from the ground to the foundation floor of the underground while supporting the external force such as earth pressure and water pressure as the support of the hypothetical steel, There is an open type method in which the temporary support is dismantled and constructed by sequentially constructing the upper part.

In the above-mentioned method, there is a limitation in application. First, it is necessary to support external force such as earth pressure and water pressure acting on the earth retaining wall in a large site where the underground structure is large and the depth of the excavation is deep, Second, there is a problem that in urban areas with dense buildings, it causes large deformation of the retaining wall and may cause damage to surrounding buildings due to subsidence of the ground. Third, There is a problem of environmental and civil complaints caused by noise, vibration and dust as a result of performing the construction of the structure. Fourth, since the construction of the permanent structure should be sequentially performed after completion of the construction of the support frame, .

In order to solve the problems of the open type method, TOP DOWN method is used in which an earth retaining wall is installed and a steel pillar and an extended pile foundation are formed as a cast pile to construct an underground structure.

The tower-down method includes a reinforced concrete tower-down method and a steel tower-down method. The reinforced concrete tower-down method requires a formwork and a steel bridge or a large steel bridge to form a reinforced concrete structure. This is economically advantageous because of the reinforcing concrete tightening, but there is a disadvantage in that the installation and dismantling of the installation material is an air or construction work.

The above-mentioned steel tower top down method has advantages of quick air and easy construction because a reinforcing truss deck or a wire truss deck is laid on a steel frame and concrete is laid. However, there is an uneconomical disadvantage that a construction cost rises due to a steel frame.

In addition, a method of taking down only the merits of the above-mentioned reinforced concrete tower down method and steel tower down method is a steel tower down method in which a double beam is formed. This is because a double beam is formed and a circumference is formed around the column, So that a large effect can be realized with a small steel member.

The applicant of the present invention has registered the horizontal skeleton structure of the building with the Korean Patent No. 10-0749855 (hereinafter referred to as "Prior Patent 1"), and Korean Patent No. 10-0967497 (Hereinafter referred to as "Prior Patent 2"), and Korean Patent Laid-Open No. 10-2012-033683 (hereinafter referred to as "Prior Patent 3") was used to construct an underground structure, This is related to a double beam consisting of columns, columns, steel beams, and slabs, and the diameter of the steel beams is reduced due to the influence of the columns.

In addition, in the prior patent 1, a horizontal structural member is mounted on a hypothetical steel column to form a foundation upstairs. Then, a horizontal structural member and a horizontal structural member below the horizontal structural member are connected and supported by using a vertical reinforcing member, In the prior art 2, a horizontal structure member is placed on a hypothetical steel column, and an interstory column is provided for each layer. When a foundation is formed, the load is supported by the interstice column, In the method of forming a column by removing a column, the prior art patent 3 is a method of attaching a lower level horizontal structure to a horizontal structure formed on a first floor by connecting the floor structure by adjusting the height, and then supporting the bracket.

However, in the prior patents 1 and 2, since a vertical steel stiffener is connected from the top to the bottom and the steel column is removed, a steel column is required or a reinforced concrete column is to be installed in a reverse stator. In the prior patent 3, the horizontal structure of the lower layer is placed in the upper layer, and after the level adjustment is completed, when the installation is completed, the connection is made to the bracket, and the calendar for mounting the horizontal structure and the bracket installation schedule There is a problem that the work process becomes complicated and the role of the horizontal structure is unclear in the flow of the force necessary for the top down construction in which the horizontal structure receives the earth pressure transmitted from the retaining structure in the three methods of the prior patent.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for measuring an exact position of a hypothetical steel column, which is formed by inserting a hypothetical steel column at predetermined intervals to construct an underground structure, In the future, when two parallel steel beams spaced apart from each other at a position where a structural column is to be placed are directly placed on the bracket and another steel beam is assembled at right angles to the bracket, a '井' And it is possible to construct an underground structure using a structure formed by a column, a pillar, a steel frame, and a slab, which can improve the economical efficiency by shortening the working time as well as the work of installing the steel frame of the horizontal structure To provide a method.

It is another object of the present invention to provide a detailed structure of a steel structure frame to receive the earth pressure transmitted from the earth retaining structure by installing a steel strip fastener at a portion where the steel frame of the horizontal structure meets the earth retaining wall, Construction of an underground structure using pillar, pillar, steel frame and slab, which can be constructed with stability and without structural gap by piling structure pillars and underground outer wall from bottom to ground layer from bottom to top. .

Another object of the present invention is to provide a method of constructing an underground structure using a structure formed by a column, a column, a steel frame, and a slab capable of increasing the structural safety by reducing the diameter of a steel beam by forming a circumference at a column of the structure .

The present invention relates to a method of constructing an underground structure using a pillar, a pillar, a steel frame, and a slab,

In the underground construction comprising a reinforced concrete pillar and a pillar, a steel beam disposed on the end surface of the pillar, and a slab installed on the steel beam, a vertical load is supported by a bracket fixed to the pillar of the steel column and the pillar of the steel column, In a construction method of constructing a building underground while holding it with a steel frame and a slab of a horizontal structure,

A first step of forming an earth retaining wall in the ground where the underground structure is to be installed;

A second step of installing a hypothetical steel column at a predetermined interval in the ground instead of the installation position of the column supporting the underground structure;

A third step of excavating the ground in which the hypothetical steel column is installed;

A fourth step of installing a truss type bracket on the hypothetical steel column where the ground is excavated;

A steel frame frame is formed on the upper surface of the bracket so as to form a connection beam in the shape of a '井' ;

A drop deck plate is installed on the bottom flange of the closed portion of the connection beam in the form of a "boss", and a slab deck plate is installed on the upper surface flange of the steel beam other than the closed portion of the " Step 6;

A seventh step of forming a ground slab by placing and curing concrete on the slab deck plate without pouring concrete into the drop deck plate;

An eighth step of excavating the ground below the ground slab;

Repeating the fourth to seventh steps of installing a truss-type bracket on the hypothetical steel column that has been excavated from the ground, and then advancing to the bottom of the underground structure;

A tenth step of placing a reinforcing bar on the foundation of the underground structure, and then placing and curing the concrete to form a foundation slab;

An eleventh step of forming a column and a column of the structure from the upper surface of the foundation slab to the ground slab;

A twelfth step of removing the brackets provided on the columns of the steel columns of each layer and removing the columns of the steel columns when the columns of the structure are formed between the slabs;

And a thirteenth step of removing the pillar columns and filling holes formed in the slabs with concrete.

Further, the earth retaining wall is a permanent structure or a permanent structure.

In addition, in the fifth step, after the steel strips are fixed and fixed to the seating grooves formed at the ends of the steel frame steel frame of the horizontal structure, the steel strip strips and the earth retaining walls are fixed to the earth pressure- And the earth pressure to be delivered is dispersed and transmitted to the steel frame and the slab of the horizontal structure.

The seating groove is formed such that the steel strip can be protruded from the upper surface of the steel frame to at least 1/2 of the thickness of the slab or within the thickness of the slab.

When the earth retaining wall is a permanent structure, the steel frame of the steel frame is disposed so as not to touch the earth retaining wall, and the triangular bracket is fixed to support the frame under the frame and the reinforcing steel is laid thereon. And the steel bridge is pulled out to form a seating groove.

In addition, in the fifth step, in the first floor portion, a portion where the earth retaining wall and the steel frame of the horizontal structure are connected may be formed by installing a reinforcing concrete frame beam instead of the steel frame brace to integrate the upper portion of the earth retaining wall and the outermost portion of the steel frame It is characterized by.

According to the present invention, after the bracket is installed by measuring the exact position of the hypothetical steel column that is formed by trenching the ground where the hypothetical steel column is embedded at regular intervals to construct the underground structure, When two spaced parallel steel rods are directly seated on the brackets and another steel rods are assembled at right angles to each other, a '' 'shaped connecting beam is formed at a position where the column is to be positioned. It is possible to have an advantage that the installation work is simple, and the economical efficiency can be improved by shortening the working time.

In addition, according to the present invention, since the steel frame belt of the horizontal structure meets the steel frame and the earth retaining wall, the steel frame frame of the horizontal structure can receive the earth pressure transmitted from the retaining structure, And the structure pillars and the underground outer wall can be pushed up from the foundation to the ground floor from above to form a stable structure without any gap.

In addition, according to the present invention, not only the structural safety can be improved by reducing the diameter of the steel frame by forming the circumference at the column of the structure, but also the umbrella-shaped connecting beam can be assembled in the field, It is possible to solve the difficulty of transportation and shorten the work process, so that it is possible to shorten the working time and to improve the economical efficiency.

1 is a flow chart
2 to 25 show the construction process of the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a flow chart of the present invention.

2 to 5, the earth retaining wall 110 is formed in the ground where the underground structure 100 is to be installed. The earth retaining wall 110 is formed of an H-beam + Cast in-place pile, SCW (Soil Cement Wall), and underground continuous wall (Slurry Wall).

The earth retaining wall 110 may be a permanent earth retaining wall or a permanent structure such as an underground continuous wall. When the installation of the earth retaining wall 110 is completed, the steel column columns 120 are installed at predetermined intervals in the ground instead of the installation positions of the column 200 supporting the underground structure 100, The position of the structural columns 120 is preferably between the columns 200 of the structure and is sometimes narrower or wider than the spacing of the columns 200 of the structure and its depth is formed to 3 m to 6 m from the bottom of the foundation of the structure. If bedrock depth is lower than that, it should extend to bedrock. In addition, the lower part is filled with concrete, and the upper load is supported by the tip support and the friction between the concrete and the rock.

 Generally, the connecting operation of the bracket 130 is excavated to a depth as much as possible by the gravity of the lower part of the foundation, and the upper end of the hypothetical steel column 120, A truss-type bracket 130 is provided. At this time, the mounting position of the bracket is made by accurate measurement. In the previous method, the elevation was adjusted by placing a high-precision member between the steel bracket 141 and the bracket 130 for the portion where the error occurred. However, when the equipment such as a laser beam is used as a measurement method, And can be measured together. If the bracket 130 is correctly installed, it means that the steel bracket 141 can be placed directly on the bracket 130 without any high-level presence. The connection between the bracket 130 and the temporary steel column 120 is made by inserting a bolt hole in the temporary steel column 120 at an accurate measuring position and fixing the side surface of the bracket 130 by bolts.

Here, the steel beam 141 at a position where the structure column 200 is installed in the future may be connected with a "well" to form a connection beam 142 in the form of a " 142 are arranged in a lattice shape. The reason why the connection beam 142 in the form of a 'well' is formed is that when the structure column 200 is installed in the future, the 'well' shape naturally forms the top 190 of the column 200. The spindle 190 shortens the span of the steel beam 141 to which the spindle 190 and the spindle 190 are connected and can be used as a small steel frame member. This means that it is economical and improves workability. This "井" is not only placed on the column. In some cases, it may be formed on the core wall which receives a large amount of vertical load, and may also be formed around the underground outer wall 210. In addition, if the column is adjacent within 4 m, it can be a long '井' shaped connecting beam including two columns.

At this time, the steel frame 140 of the horizontal structure thus formed and the slab 180 formed by pouring concrete receive the earth pressure transmitted from the earth retaining wall 110. The earth pressure is suitably applied to the steel frame 140 of the horizontal structure, And the slabs 180, the steel strips 150 need to play a role. The former technique forms a reinforced concrete frame beam, and when the concrete frame is installed together with the slab concrete placed in the steel frame 140, the earth pressure is transmitted. However, in this case, when forming the basement outer wall 210 in the present structure, since the concrete is poured through the hole on the pavement beam pavement to form the basement outer wall 210, separation phenomenon occurs between the pavement beam and the basement outer wall 210 Which caused many inconveniences such as the occurrence of the leak, and caused the defect to leak. In the present invention, the transmission of the earth pressure is also effective and the underground outer wall 210 is not separated.

As shown in FIG. 6, the connecting structure between the steel frame 140 and the earth retaining wall 110 of the horizontal structure includes a seating groove 141 formed at an end of the steel frame 141 of the steel frame 140 of the horizontal structure, And the earth retaining wall 110 and the earth retaining wall 110 are fixed to the earth pressure transmitting member 160 by a predetermined distance after the steel strip supporting member 150 having passed through the through hole 151 is fixed by welding and bolting, So that the earth pressure transmitted from the earth retaining wall 110 is transmitted to a plurality of earth pressure transmitting members 160 spaced apart by a predetermined distance.

The seating groove 141 'in which the steel strip supporting member 150 is seated is formed such that the steel strip supporting member 150 is supported on the upper surface of the steel beam 141 by a thickness of not less than 1/2 of the thickness of the grounding slab 180, And when the steel strip 150 protrudes less than 1/2 of the thickness of the ground slab 180, the dispersion of the earth pressure transmitted to the ground slab 180 becomes small, The reinforcing bars laid on the ground slab 180 are hardly fixed to the underground outer wall 210. In this case,

7, the steel frame 140 of the horizontal structure and the earth retaining wall 110 may be connected to each other by a reinforcing concrete frame beam at the end of the steel frame 141 of the steel frame 140 of the horizontal structure The steel wire rods 141 are disposed so as not to touch the earth retaining wall 110 and the triangular bracket 110 'is fixed to support the rim lower beam form and the reinforcing steel rods are placed thereon. A seating groove 141 'is formed at a portion where the reinforcing steel foot and the steel frame 141 are collided with the steel frame 141. Here, the connection reinforcing bar (R) should be arranged vertically in order to be integral with the earth retaining wall 110 in the future, and a hypothetical pipe P for pouring concrete should be installed for concrete pouring.

As shown in FIG. 8, the steel strip supporting member 150 can be replaced with a frame beam integrated with a reinforced concrete cap beam. This is because it is necessary to integrate the earth retaining walls 110 in the first floor so that the displacement of the earth retaining walls 110 can be unified. Therefore, in the case of the first layer, the reinforced concrete frame beam is formed in a state including the steel frame beam 141 in a thickness that the thickness of the earth retaining wall 110 and the thickness of the underground outer wall 210 of the present structure are combined and the reinforcing concrete wall frame 110 and the ' Shaped connecting beam 142 to move integrally.

When the earth retaining wall 110 is a permanent structure such as an underground continuous wall or the like, the steel strip supporting member 150 is not required and the reinforced concrete rim without the reinforced concrete pipe P and the connecting reinforcing bar R Install the beam.

9 to 11, a drop deck plate 170 is installed on the bottom flange of the closed portion of the 'umbrella-shaped connecting beam 142', and the 'deck' shaped The deck plates 170 and 170 'are installed on the upper surface flange of the steel beam 141 other than the closed portion of the connecting beam 142. The deck plates 170 and 170' Is preferably one of a reinforcing truss deck plate or a wire truss deck plate capable of withstanding the working load at the time of pouring and a drop installed on the bottom flange of the closed part of the ' Concrete is placed on the slab deck plate 170 'formed on the upper surface of the steel frame 140 of the horizontal structures other than the deck plate 170 to form the vertical bar 190, From It is to resist the earth pressure. At this time, the boundary between the top 190 and the slab portion is formed on the upper part of the steel frame of the horizontal structure, and separated between the two members by a construction joining material such as a metal lath.

When the deck plates 170 and 170 'are installed on the steel frame 140, the slab deck plates 170 installed on the upper surface of the steel frame 140 of the horizontal structure other than the' ') To form a ground slab 180. [0041] Here, it is general that concrete is not laid on the drop deck plate 170. This is because the reinforced concrete columns should be formed and integrated when they are formed. However, in the case of the first ground floor, the vehicle may have to be operated or may have a role of receiving the earth pressure. Accordingly, in some cases, the column deck plate may be partially buried, It is possible to pour concrete into the concrete.

When the concrete is cured in the concrete poured layer, the ground below the ground slab 180 is squeezed as shown in FIGS.

A process of installing a truss-type bracket 130 at a position where a steel frame 140 of a horizontal structure of a lower layer is to be installed on a hypothetical steel column 120 formed by digging the ground below the ground slab 180, A step of forming a steel frame frame 140 of a horizontal structure so that the connection beams 142 in the form of a 'ight' are arranged in a lattice form by seating and connecting the steel frame beams 141 on the upper surface of the frame 130, The frame member 140 is mounted and fixed to the mounting groove 141 'formed at the end of the frame 140 and the frame member 150 and the earth retaining wall 110 are connected to the earth pressure transmitting member 160, And a step of fixing the bottom flange of the closed portion of the 'umbrella-shaped connecting beam 142 and the closed portion of the' umbrella-shaped connecting beam 142, The drop deck plate 170 and the slab deck plate 170 ' 17A and 17B, the process of forming the slab 180a by placing and curing concrete on the slab deck plate 170 'and the process of excavating the bottom of the slab 180a are repeated, Likewise, the bottom of the foundation of the underground structure 100 is excavated.

After a reinforcing bar is laid on the foundation of the underground structure 100, concrete is laid and cured to form a foundation slab 180b. Then, as shown in FIGS. 18 to 20, a reinforced concrete column is installed, Respectively. First, a pillar reinforcement is disposed at a central portion of a connection beam 142, which is a position of a pillar, and a pillar is installed up to the bottom of a connection beam 142 having a pillar shape, At this time, the installed drop deck plate 170 is cut by the size of the pillar so that the pillar 200 and the pillar 190 can be integrally concrete.

A concrete column 190 is formed inside the reinforcing concrete column and the connection beam 142 of '井' shape from the concrete slab 180b to the connection beam 142 of '井' shape on the base slab 180b, And the foundation pillars 200 connected to the foundation slabs 180b are formed.

At this time, a mold is installed to house the earth pressure transmitting member 160 and the steel band strip joist 150 inside the earth retaining wall 110 between the foundation slab 180b and the slab 180a above the foundation slab 180b And concrete is placed and cured in the mold to form an underground outer wall 210. Here, the underground outer wall 210 may be constructed as a structure column 200 or may be constructed at different times.

The slabs 180a on the foundation slabs 180b and the upper slabs on the upper slabs 180a are arranged in line with the structural columns 200 to form the formwork and the reinforcing bars in the center of the ' And the upper part of the slab 180a and the upper part of the slab 180a are separated from each other in a state where the foundation slab 180b and the ' And the upper and lower slabs of the upper and lower slabs 180 and 180. The process of forming the tops 190 and the pillars 200 is repeated until the ground slab 180 is poured and cured.

At this time, the dies are housed in the earth retaining wall 110 between the slabs 180a on the foundation slabs 180b and the upper slabs on the slabs 180a to receive the earth pressure transfer member 160 and the steel strip support members 150 After the installation, the process of forming the underground outer wall 210 by placing and curing concrete in the formwork is repeated up to the ground slab 180.

The concrete poured to form the underground outer wall 210 is poured into the space between the earth retaining wall 110 under the steel wire band saw 150 and the formwork through the through hole 151 of the steel wire band saw 150, At the same time, the reinforcing bars of the slabs 180a located in the through holes 151 are buried.

The building columns 200 and the basement outer walls 210 may be formed at the same time or the basement outer walls 210 may be formed later than the structure columns 200. This is because the structure column 200 is constructed first and the ground construction is first performed, and the underground outer wall 210 is a structure existing only in the underground. 21 to 22, the column 200 may be sequentially formed from the ground slab 180 to the upper surface of the foundation slab 180b, and the ground slab 180 and the foundation slab 180b may be sequentially formed. A ground layer is formed first from any one of the plurality of slabs between the foundation slabs 180b to the ground slab 180 so that the ground layer is first applied to the foundation slab 180b. After completion of the foundation slab 180b, As shown in FIG. In the present invention, it is the core of the present invention that the steel frame 140 of the horizontal structure is supported while the construction is performed downward. Therefore, the construction of the structure column 200 in the whole step process can be performed first or later according to the actual situation.

When the structure pillars 200 are formed between the slabs 180, 180a and 180b of the underground structure 100 by repeating the above process, as shown in FIG. 23, the brackets 130, After the temporary steel column 120 is removed, the temporary steel column 120 is removed and holes (not shown) formed in the respective slabs 180, 180a and 180b are filled with concrete and cured, As shown, an underground structure 100 is formed.

While the present invention has been described with reference to the particular embodiments and drawings, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting in any ordinary or prejudicial sense. It must be interpreted in terms of meaning and concept. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only examples of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

100: underground structure 110: retaining wall
120: Hypothesis steel column 130: Bracket
140: Steel frame 150: Steel strip
160: earth pressure transmitting member 170: deck plate
180: ground slab 190:
200: Structure column

Claims (8)

In the underground construction comprising a reinforced concrete pillar and a pillar, a steel beam disposed on the end surface of the pillar, and a slab installed on the steel beam, a vertical load is supported by a bracket fixed to the pillar of the steel column and the pillar of the steel column, In a construction method of constructing a building underground while holding it with a steel frame and a slab of a horizontal structure,
A first step of forming an earth retaining wall in the ground where the underground structure is to be installed;
A second step of installing a hypothetical steel column at a predetermined interval in the ground instead of the installation position of the column supporting the underground structure;
A third step of excavating the ground in which the hypothetical steel column is installed;
A fourth step of installing a truss type bracket on the hypothetical steel column where the ground is excavated;
A steel frame frame is formed on the upper surface of the bracket so as to form a connection beam in the shape of a '井';
A drop deck plate is installed on the bottom flange of the closed portion of the connection beam in the form of a "boss", and a slab deck plate is installed on the upper surface flange of the steel beam other than the closed portion of the " Step 6;
A seventh step of forming a ground slab by placing and curing concrete on the slab deck plate without pouring concrete into the drop deck plate;
An eighth step of excavating the ground below the ground slab;
Repeating the fourth to seventh steps of installing a truss-type bracket on the hypothetical steel column that has been excavated from the ground, and then advancing to the bottom of the underground structure;
A tenth step of placing a reinforcing bar on the foundation of the underground structure, and then placing and curing the concrete to form a foundation slab;
An eleventh step of forming a column and a column of the structure from the upper surface of the foundation slab to the ground slab;
A twelfth step of removing the brackets provided on the columns of the steel columns of each layer and removing the columns of the steel columns when the columns of the structure are formed between the slabs;
And a step of filling the holes formed in the slabs with concrete by removing the pillar columns. The method for constructing an underground structure using a pillar, a pillar, a steel frame, and a slab.
The method according to claim 1, wherein, in the first step,
Wherein the earth retaining wall is a hypothetical or permanent structure, and a method of constructing an underground structure using a pillar, a pillar, a steel beam, and a slab.
The method according to claim 1, wherein, in the fifth step,
The steel strip is fixed and fixed to the earth moving wall at a predetermined distance by the earth pressure transmitting member so that the earth pressure delivered from the earth retaining wall is transmitted to the steel frame of the horizontal structure And the slabs are distributed to be distributed in a frame and a slab. The method of constructing an underground structure using a pillar, a steel frame, and a slab-formed structure.
The method of claim 3,
Wherein the seating groove is formed so that the steel strip can protrude from the upper surface of the steel frame to a thickness of less than 1/2 of the thickness of the ground slab to less than the thickness of the ground slab.
The method of claim 2,
When the earth retaining wall is a permanent structure, the steel frame of the steel frame is disposed so as not to contact with the earth retaining wall, the triangular bracket is fixed to support the frame under the frame, the steel reinforcement is placed thereon, A method of constructing an underground structure using a pillar, a steel frame, and a structure formed of steel bars and slabs.
The method according to claim 1,
In the fifth step, a reinforcing concrete frame beam is installed in place of the steel frame brace to connect the earth retaining wall to the steel frame frame of the horizontal structure in the first layer portion, and the upper part of the earth retaining wall and the outermost frame of the steel frame are integrated. Construction Method of Underground Structures Using Columns, Columns, Steel Beams and Slabs.
The method according to claim 1,
Characterized in that the structure column is formed up to a ground slab from any one of the plurality of slabs between the ground slab and the foundation slab, and the lower one of the slabs is formed after the foundation slab is completed. Construction Method of Underground Structures Using Structures Consisting of Steel Beams and Slabs.
The method according to claim 1,
Wherein the column of the structure is sequentially formed from the ground slab to the upper surface of the foundation slab, wherein the column is formed of a pillar, a steel frame, and a slab.

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