KR100938918B1 - Top-down construction method using steel frame by channel - Google Patents

Abstract

PURPOSE: A Top-down construction method using a twig type steel frame by a channel for continuous construction of a basement outer wall is provided to facilitate application in a field by using a twig type steel frame assembled simply by a channel. CONSTITUTION: A Top-down construction method using a twig type steel frame by a channel for continuous construction of a basement outer wall comprises the steps for installing a twig type steel frame assembled simply by a channel between a retaining wall(110) and a slab to transmit earth pressure; and successively constructing the basement outer wall after securing the continuous construction space of the basement outer wall.

Description

Top-down construction method using steel frame by channel for continuous construction of underground walls

The present invention relates to a reverse drilling method for constructing the underground part of a building by excavating while supporting the earth pressure directly to the underground part of the building (beam, slab), and more specifically, using a twig-shaped steel frame by a channel. The underground part of the building is constructed in reverse order, while the underground exterior wall is sequentially constructed.

In general, the method of constructing the underground part of a building can be divided into the forward and reverse method according to the construction direction. The netting method is a method of constructing a sequential wall, supporting it with a temporary support (horizontal brace, raker, earth anchor rock bolt, etc.), tacking to the bottom of the basement, and then constructing the structure sequentially from the basement to the bottom. . The reverse drilling method is a method of constructing a wall of clay and constructing a structure in the reverse order while further down the pit and structure work. It is called a top-down method. The reverse drilling method is possible to shorten the air by the combination of the trench and the ground work, and to secure the structural stability by using the permanent structure as the support wall of the earth wall, and it is advantageously applied to the construction of the downtown because of the low noise and vibration.

On the other hand, underground buildings generally proceed with a method of constructing a structure by excavating the inner wall of the retaining wall after constructing a heat-retaining retaining wall such as H-Beam + earth plate, CIP (Cast in-Place Pile), SCW (Soil Cement Wall), etc. Excavation process is accompanied by a bracing work to support external forces, such as earth pressure transmitted through the wall. Generally, temporary wall struts, ground anchors, or permanent structures are used for the construction of the retaining walls. Among these, adjacent structures in the city center use the permanent structures to secure structural stability, shorten the air, and generate civil complaints. It is the most advantageous when considering aspects, such as possession inhibition.

Reinforcement method using permanent structure is a reverse support method combined with reverse punching method. Reverse punching method is the process of constructing beam and slab, which is a horizontal structure between floors in the basement part of the building, to serve as a permanent structure to support the wall. After repeatedly performing in reverse order, it proceeds by constructing the outer wall. In the reverse support method, the basement outer wall is first constructed as a part for supporting the retaining wall in the form of a rim beam and slab, and the rest is later constructed. In other words, the basement outer wall is to be separated. Separation of the basement outer walls makes continuous reinforcement of wall reinforcement and continuous construction of wall concrete difficult, which in turn degrades the structural performance of the basement walls.In addition, it causes leakage problems through construction joints, causing corrosion of reinforcing bars and deterioration of concrete. It may also cause the durability of the back structure.

The present invention was developed in order to solve the problems related to the construction of the basement outer wall at the same time in the conventional reverse drilling method, there are the following technical problems.

First, in constructing the underground part of the building by reverse drilling method, the other parts should be constructed in reverse order, but only underground exterior walls are sequentially installed to provide a method of minimizing construction joints.

Second, in constructing the underground part of the building by reverse drilling method, it is intended to provide a method to minimize construction work and improve construction, as well as to secure a certain construction quality and economic feasibility.

In order to solve the above technical problem, the present invention in the construction of the underground part of the building by reverse drilling method by installing a branched steel frame assembled with channels between the retaining wall and the slab earth pressure by the branched steel frame The present invention provides a method of sequentially constructing an underground exterior wall while effectively realizing transmission and securing a continuous construction space of the underground exterior wall.

According to the present invention, the following effects can be expected.

First, since the basement outer wall can be sequentially installed from the lower layer, it is possible to minimize the occurrence of construction joints of the basement outer wall, thereby improving the construction quality of the basement outer wall while blocking leakage caused by the construction joint.

Second, in the construction of the support to support the retaining wall can minimize the construction work, such as mold, reinforcing bars, thereby improving the overall construction and economic efficiency in the reverse drilling method.

Third, since it uses a branched steel frame that is simply assembled as a channel member, it can be easily applied to the field. In addition, since the branched steel frame can be manufactured by standardizing a part of it, it can be applied while minimizing the amount of field work.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

The reverse drilling method according to the present invention relates to a reverse drilling method for constructing the underground part of a building by excavating while supporting the earth pressure directly to the underground part of the building (beams, slabs), and in constructing the underground part of the building by the reverse drilling method. By installing and installing the branched steel frame 200 assembled between the retaining wall 110 and the slab 160, the earthquake pressure transmission is effectively realized by the branched steel frame 200, while the continuous construction of the basement outer wall. After securing the space there is a technical feature to sequentially build the basement outer wall 180 sequentially. 1A to 1H show the construction procedure of the reverse drilling method according to the present invention, the present invention will be described step by step with reference to this.

(a) step: construction of the retaining wall and the inner pillar- Figure 1a

Construct the earth wall 110 according to the construction line. Soil wall 110 can be installed as a H continuous pile, earth plate, CIP, SCW, sheet pile, as well as underground continuous wall (slurry wall). In the present invention can be confirmed through the embodiment the thumb pile (110a) by the H-beam and reinforced concrete pillars to construct the main wall wall 110 completed by the main heating method.

After constructing the retaining wall 110, the inner pillar 120 is constructed into the retaining wall 110. In this step, the inner pillar 120 is a permanent column constituting the structure of the basement of the building. The inner column 120 may be constructed of steel or PC.

(b) step: gulting and brackets-Figure 1b

The ground wall 110 excavates the ground. The pit depth is carried out while considering the stable support state of the retaining wall (110).

After the excavation, the bracket 130 is fixed to the earth wall 110. Since the bracket 130 is configured to stably support the outer horizontal beam 150b installed in the step (d) together with the mounting beam 140 installed in the step (c), the design plan of the outer horizontal beam 150b You only need to install it at the appropriate location. The bracket 130 is permanently buried in the basement outer wall 180 constructed in step (h) together with the mounting beam 140 installed in step (c), and in view of this, the bracket 130 is the basement outer wall 180. Do not protrude from the

(c) step: mounting bracket-Figure 1c

Bracket 130 is installed while mounting on the bracket 130 to connect the bracket 140 to each other. At this time, the mounting beam 140 should be installed to be located inside the basement outer wall 180 to be constructed in step (h). Thus, the mounting beam 140 is embedded so as not to protrude from the basement outer wall 180 frees the space utilization of the basement of the building. Furthermore, the mounting beam 140 is more preferably installed to be located in the center of the basement outer wall 180, which is the mounting beam 140 without being disturbed by the mounting beam 140 in the process of (h). This is because the wall reinforcement 181 can be continuously arranged with the gap therebetween.

Step (d): horizontal beam installation-FIG. 1d

While installing the inner horizontal beams 150a connecting the inner pillars 120 to each other, and connecting the outer horizontal beams 150b facing the retaining wall 110 to the inner pillars 120 and mounting them on the mounting beam 140. Install. In this step, the inner horizontal beam 150a and the outer horizontal beam 150b become permanent beams that constitute the structure of the basement of the building.

The inner horizontal beam 150a and the outer horizontal beam 150b may be installed as a steel member, a PC member, a steel member and a composite member of a PC or RC, etc., but only when the steel member is installed as a composite member of steel and RC. The RC part can be installed at the stage and can be installed with the slab 160 construction in the step (f). Furthermore, the inner horizontal beam 150a and the outer horizontal beam 150b may be installed in a form in which an end portion is reinforced in response to a moment. In the embodiment of the present invention can check the outer horizontal beam (150b) of the H-beam.

Step (e): Installing a Twig Type Steel Frame-FIG. 1E

It installs while mounting the twig-shaped steel frame 200 on the outer horizontal beam (150b). The twig-shaped steel frame 200 has a central channel 210 located in the center, a connection channel 220 and an imine channel 230 extending from both sides from the central channel 210 as a basic configuration, and the central channel 210. As the tree trunk is large and the connecting channel 220 and the inner channel 230 become small branches extending from both sides of the central channel 210, the tree-shaped steel frame 200 is named. However, the twig-shaped steel frame 200 is assembled by using a channel member having both side plates and a bottom plate as a base member, and the channel member having both side plates and a bottom plate is a member having a basic U-shaped cross section (usually Channel member), as well as H-shaped cross-section member (both flanges are both side plates and webs are bottom plates), and can be produced and obtained by various methods such as bending steel, sheet bending, and welding of steel sheets. The twig-shaped steel frame 200 may be installed while assembling each component directly on the outer horizontal beam 150b, and may be prepared and installed in a state in which some or all of the components are assembled.

Twig-type steel frame 200 directly serves as a earth pressure carrier for transmitting earth pressure to the slab 160 to be constructed in step (f) from the earth wall 110, indirectly between the branches and branches It serves to provide an empty space (between the connection channel and the imminent channel) to the continuous reinforcement space of the wall reinforcement 181 to be constructed in step (h) and the placing space of the wall concrete 182.

On the other hand, the twig-shaped steel frame 200 should be a stable earth pressure carrier, the present invention proposes three embodiments as a concrete implementation plan for the twig-shaped steel frame 200 to be a stable earth pressure carrier, for this Details will be described later (see 2a to 4d).

Step (f): Slab Construction- Fig. 1f

The slab 160 is constructed while placing the slab concrete 162 on the inner horizontal beam 150a and the outer horizontal beam 150b. At this time, the slab 160 should be constructed so as to be continuously integrated in the tree-shaped steel frame 200 to be integrated. Thus, the slab 160 is a horizontal brace supporting the retaining wall 110 together with the twig-shaped steel frame 200. The integration method of the twig-shaped steel frame 200 and the slab 160 will be described later (see 2a to 4d).

The slab 160 can be constructed by placing the slab concrete 162 after installing the deck or by installing the slab concrete 162 and then placing the slab concrete 162, according to the structural calculation, the slab reinforcement (161) appropriately Of course, I'm going back. The slab formwork is removed after completing the slab 160.

(g) step: repeated execution- FIG. 1g

Steps (b) to (f) are repeated. The bottom floor is constructed with a mat base. By the progress of this step, the base frame is completed except for the basement outer wall 180. That is, the inner pillar 120 and the interlayer beam and the interlayer slab 160 of the basement of the building are completed.

(h) step: underground exterior wall construction- Fig. 1h

In the twig-shaped steel frame 200, the reinforcement of the wall reinforcement 181 through the empty space between the connection channel 220 and the inner channel 230, and placing the concrete wall 182 while placing the outer concrete wall 180 Construct. Under the progress of this step, the basement outer wall 180 is completed, the twig-shaped steel frame 200 is embedded in the wall concrete 182 is integrated. This completes all the frames in the basement of the building.

2a to 2d show a first embodiment of the reverse drilling method according to the present invention, the first embodiment is configured to transmit the earth pressure to the twig-shaped steel frame 200 only.

Figure 2a shows a twig-shaped steel frame 200 used in the first embodiment of the present invention, the center channel 210, the connection channel 220, the inner channel 230, the connection stiffener 240 as shown And, the end plate 250, the first stud 260 is composed of, by this configuration the twig-shaped steel frame 200 serves as a earth pressure carrier by itself. The twig-shaped steel frame 200 is designed to suit the required strength at the installation site, while properly designing the cross-section and rigidity of each component, but only because the twig-shaped steel frame 200 must deliver earth pressure Design to have sufficient cross section performance. For example, each constituent member is composed of c-beams or H-beams.

The central channel 210 is installed by mounting on the outer horizontal beam 150b, and is disposed to be continuously connected along the retaining wall 110 while being positioned inside the cross section of the basement outer wall 180. The connection channel 220 is installed to connect one side plate and the retaining wall 110 of the central channel 210, and the connection channels 220 are spaced apart from each other. The inner channel 230 is installed so as to extend from the other side plate of the central channel 210, the inner channel 230 is spaced apart from each other. The central channel 210, the connection channel 220, the mining channel 230 is welded to each other, the central channel 210 and the mining channel 230 is prepared in a predetermined standard and welded in the field or factory, the connection channel 220, the fixed channel may be welded while cutting appropriately in the field so as to flexibly absorb the construction error of the earth wall 110 is not uniformly constructed.

The connection stiffener 240 is configured to connect the two side plates of the central channel 210 while continuously connecting to the side plate of the inner channel 230 from the side plate of the connection channel 220, the connection stiffener A stable stress flow is formed from the connection channel 220 through the central channel 210 by the 240 to the inner channel 230. The connection stiffener 240 may be installed horizontally or vertically with various types of members such as plates and angles. The end plate 250 is configured to be provided with the same or wider plate surface than the end of the inner channel 230 and is installed to close the end of the inner channel 230, and the end plate 250 is disposed of the slab concrete 162. At the slab concrete 162 serves to block the filling inside the twig-shaped steel frame 200, as well as acupressure plate to stably transfer earth pressure bearing force from the slab (160) to the twig-shaped steel frame (200) Role. The first stud 260 is configured to protrude and bond to the end plate 250, the twig-shaped steel frame 200 and the slab 160 is integrated in the construction process of the slab 160 by the first stud 260, In FIG. 2A, the first stud 260 of the bolt type may be confirmed. The connecting stiffener 240, the end plate 250, and the first stud 260 are also welded and installed.

2B illustrates a state in which the twig-shaped steel frame 200 of FIG. 2A is installed. As shown, the twig-shaped steel frame 200 is installed by connecting the connecting channel 220 to the retaining wall 110, and is installed by mounting the central channel 210 on the outer horizontal beam (150b). Furthermore, as shown in FIG. 2B, the second stud 270 may be further bonded to the twig-shaped steel frame 200. The second stud 270 may be installed to protrude to the inside or the outside of the central channel 210, the second steel stud 270 and the twig-shaped steel frame 200 during the construction of the basement outer wall 180 The basement outer wall 180 is integrated. The second stud 270 is not limited in the form of bolts, plates, laths, etc. In FIG. 2B, a case in which the bolt-type second studs 270 protrude and join the inside of the central channel 210 may be confirmed.

On the other hand, the inner channel 230, as shown in Figure 2b not only can be installed so that its end coincides with the subterranean outer wall line, although not shown, it is also possible to be installed so as to be located in the outer and outer subterranean wall line as well. However, if the end of the inner channel 230 is located in the basement outer wall line, the slab 160 will be a part of the extension to the inside of the outer wall line before the construction of the basement outer wall 180, the end of the end channel 230 is underground If it is located outside the outer wall line, the internal channel 230 will be embedded in the slab 160 by the slab 160 construction.

FIG. 2C illustrates a state in which the slab 160 is constructed after installing the twig-shaped steel frame 200 as shown in FIG. 2B. As shown, when the slab concrete 162 is poured around the end plate 250 of the twig-shaped steel frame 200, the first stud 260 of the twig-shaped steel frame 200 is slab concrete 162. While being embedded in the twig-shaped steel frame 200 and the slab 160 is integrated. As a result, the supporting structure of the retaining wall 110 is completed by synthesizing the twig-shaped steel frame 200 and the slab 160.

FIG. 2D illustrates a state in which the basement outer wall 180 is constructed after repeating the construction of the slab 160 as shown in FIG. 2C to the basement lower floor. As shown, the wall reinforcement 181 is continuously reinforced and the wall concrete 182 is poured through the empty space between the connection channel 220 of the twig-shaped steel frame and the inner channel 230. The wall concrete 182 is also placed inside the twig-shaped steel frame 200, whereby the twig-shaped steel frame 200 is embedded in the basement outer wall 180 is integrated with the basement outer wall 180. In particular, if the second stud 270 is provided in the twig-shaped steel frame 200, the integration of the twig-shaped steel frame 200 and the basement outer wall 180 is strengthened.

3a to 3d show a second embodiment of the reverse drilling method according to the present invention, the second embodiment is configured to deliver the earth pressure by the combination of the twig-shaped steel frame 200 and the slab concrete 162 .

Figure 3a shows a twig-shaped steel frame 200 used in the second embodiment of the present invention, as shown is composed of a central channel 210, a connection channel 220, the inner channel 230, such as As the slab concrete 162 is filled in the twig-shaped steel frame 200 of the configuration, it serves as a stable earth pressure carrier. The central channel 210, the connection channel 220, and the mining channel 230 are the same as described in the first embodiment. However, since the second embodiment serves as a earth pressure carrier by synthesizing the twig-shaped steel frame 200 and the slab concrete 162, the cross-sectional performance of the twig-shaped steel frame 200 is reduced compared to the first embodiment. Applicable For example, the channel member synthesized with the slab concrete in the twig-shaped steel frame 200 is configured to be bent into a plate bent c-channel. The twig-shaped steel frame 200 of FIG. 3A is an example in which the central channel 210 and the internal channel 230 are formed of a plate bent type c channel while the connecting channel 220 is formed of an H-beam, and the center channel 210 is formed. Slab concrete is poured and synthesized only in the endogenous channel 230 and the endogenous channel because the cross-sectional performance is smaller than that of the connecting channel 220 composed of H-shaped steel. More is being prepared. The twig-shaped steel frame 200 of FIG. 3a may be appropriately modified in a form in which the slab concrete 162 is poured into the connection channel 220.

Meanwhile, in the second embodiment, the twig type steel frame 200 may further include a form tie 280 and a second stud 270 as shown in FIG. 3A. The form tie 280 is a member which is installed to connect both side plates of the central channel 210 while floating in the bottom plate of the central channel 210, filling the slab concrete 162 inside the central channel 210. While smoothing the filling of the slab concrete 162 in the process and suppresses the deformation of the central channel (210). The form tie 280 may be installed in various forms such as a bolt and a plate, and in FIG. 3A, the form tie 280 may be checked by vertically welding the plate. As in the first embodiment, the second stud 270 is a member provided to integrate the twig-shaped steel frame 200 and the basement outer wall 180 in the process of constructing the basement outer wall 180, and in FIG. 3A, a plate type. The second stud 270 of the protruding outwardly bonded to the lower center channel 210 can be confirmed.

Furthermore, in the second embodiment, the twig-shaped steel frame 200 may have another side plate of the central channel 210 at a height lower than that of one side plate as shown in FIG. 3A. This is to consider the fixing of the slab reinforcing bars 161 (see Fig. 3c).

3B illustrates a state in which the twig-shaped steel frame 200 of FIG. 3A is installed. As shown, the twig-shaped steel frame 200 is installed by connecting the connection channel 220 to the retaining wall 110, and is mounted by mounting the central channel 210 on the outer horizontal beam (150b).

FIG. 3c illustrates a state in which the slab 160 is constructed after the twig-shaped steel frame 200 is installed as in FIG. 3b. As shown, the slab concrete 162, including the inside of the twig-shaped steel frame 200 is poured. In FIG. 3C, as a result of applying the twig type steel frame 200 of FIG. 3A, the slab concrete is poured into only the central channel 210 and the imminent channel 230. As a result, the slab 160 is continuously formed from the retaining wall 110, and thus, the supporting structure of the retaining wall 110 is completed. In particular, if the other side plate of the central channel 210 in the twig-shaped steel frame 200 is provided at a low height, in the slab 160 construction process in the reinforcement of the slab reinforcing bars 161, the central steel channel of the twig-type steel frame 210 Beyond the other side plate of) to reach inside the central channel 210. This is for the settlement of the slab reinforcement (161).

FIG. 3d illustrates a state in which the basement outer wall 180 is constructed after repeating the construction of the slab 160 as shown in FIG. As shown, the reinforcement of the wall reinforcement 181 is continuously placed through the empty space between the connection channel 220 of the tree-shaped steel frame 200 and the internal channel 230, and the wall concrete 182 is poured. Thus, the twig-shaped steel frame 200 is embedded in the basement outer wall 180 is integrated with the basement outer wall 180. In particular, if the second stud 270 is provided in the twig-shaped steel frame 200, the integration of the twig-shaped steel frame 200 and the basement outer wall 180 is strengthened.

4A to 4D show a third embodiment of the reverse punching method according to the present invention, which is a modification of the second embodiment described above.

Figure 4a shows the twig-shaped steel frame 200 used in the third embodiment of the present invention, there is a difference in that there is no connection stiffener 240, and the twig-type steel frame used in the first embodiment as a whole same. In other words, in the third embodiment, the twig-shaped steel frame 200 includes a central channel 210, a connection channel 220, an inner channel 230, an end plate 250, and a first stud 260. It is configured by. The twig-shaped steel frame 200 of such a configuration is a form proposed to be synthesized by pouring the slab concrete 162 only in the central channel 210 and the connection channel 220, the twig-shaped steel frame 200 of Figure 3a Similarly, the slab concrete 162 in the connection channel 220 can be appropriately modified in a form that is not poured. Furthermore, the twig-shaped steel frame 200 of the third embodiment may further include a second stud 270 and a form tie 280, and the second stud 270 and the form tie 280 may be formed of the first stud 270. The configuration is the same as described in the second embodiment.

4B illustrates a state in which the twig-shaped steel frame 200 of FIG. 4A is installed. As shown, the twig-shaped steel frame 200 is installed by connecting the connection channel 220 to the retaining wall 110, and is mounted by mounting the central channel 210 on the outer horizontal beam (150b).

4C illustrates a state in which the slab 160 is constructed after installing the twig-shaped steel frame 200 as in FIG. 4B. As shown, the slab concrete 162, including the inside of the twig-shaped steel frame 200 is poured. In FIG. 4C, as a result of applying the twig type steel frame 200 of FIG. 4A, the slab concrete 162 may be placed only on the center channel 210 and the connection channel 220. As a result, the slab 160 is continuously formed from the retaining wall 110, and thus, the supporting structure of the retaining wall 110 is completed.

FIG. 4D illustrates a state in which the basement outer wall 180 is constructed after repeating the construction of the slab 160 as shown in FIG. 4C to the lowest basement floor. The basement outer wall 180 is completed in the same manner as in the case of the second embodiment described above.

The present invention has been described in detail above with reference to specific embodiments, but the embodiments are only for illustrating the present invention, and thus the embodiments substituted, added, and modified within the scope without departing from the spirit of the present invention are also described below. It will be said to belong to the protection scope of the present invention as defined by the claims appended hereto.

1A to 1H show the construction sequence of the reverse punching method according to the present invention.

Figures 2a to 2d shows a first embodiment of the reverse drilling method according to the present invention, a perspective view (2a) showing a twig-shaped steel frame by the channel, a detailed view showing a state in which the twig-shaped steel frame is installed (2b), detailed drawing (2c) which shows the state after slab construction, and detailed drawing (2d) which shows the state after construction of an underground outer wall.

Figure 3a to 3d shows a second embodiment of the reverse drilling method according to the present invention, a perspective view (3a) showing a twig-shaped steel frame by the channel, a detailed view showing a state where the twig-shaped steel frame is installed (3b), detailed drawing (3c) which shows the state after slab construction, and detailed drawing (3d) which shows the state after construction of an underground outer wall.

Figures 4a to 4d shows a third embodiment of the reverse punching method according to the present invention, a perspective view (4a) showing a twig-shaped steel frame by the channel, a detailed view showing a state where the twig-shaped steel frame is installed (4b), detailed drawing (4c) which shows the state after slab construction, and detailed drawing (4d) which shows the state after construction of an underground outer wall.

<Description of the symbols for the main parts of the drawings>

110: retaining wall 110a: thumb pile

120: inner pillar

130: bracket

140: pedestal

150a: horizontal level beam 150b: horizontal level beam

160: slab

180: outer wall

200: twig steel frame

210: center channel 220: connection channel

230: Immunization channel 240: Connection stiffener

250: end plate 260: first stud

270: second stud 280: form tie

Claims (7)

It is a reverse drilling method that constructs the underground part of the building by excavating while supporting the earth pressure directly to the underground part of the building. (a) constructing the mud wall 110, and constructing the inner pillar 120 into the mud wall 110; (b) excavating the inner ground of the retaining wall 110 and fixing the bracket 130 to the retaining wall 110; (c) the bracket 130 is installed while mounting on the bracket 130 to connect the mounting beam 140 to each other, the mounting beam 140 to the inside of the basement outer wall 180 to be constructed in the following (h) step Installing to locate; (d) Installing the inner horizontal beam (150a) to connect the inner column (120) with each other, connect the outer horizontal beam (150b) facing the earth wall 110 to the inner column (120) and mounting beam 140 Installing while mounting on; (e) installing the twig-shaped steel frame 200 assembled with a channel member having both side plates and a bottom plate on the outer horizontal beam 150b; (f) Constructing the slab 160 while placing the slab concrete 162 on the inner horizontal beam 150a and the outer horizontal beam 150b, but continuously from the twig steel frame 200 to the slab 160 Constructing to carry; (g) repeating steps (b) to (f); (h) reinforcing the wall reinforcement 181 through the empty space between the tree-shaped steel frame 200 and constructing the outer wall 180 while pouring the wall concrete 182; The step (e) is mounted on the outer horizontal beam (150b) is installed in the center channel (12) while being located in the cross section of the underground wall (180) to be constructed in step (h) to be continuously connected along the retaining wall (110) 210); A connection channel 220 installed to connect one side plate and the retaining wall 110 of the central channel 210 and spaced apart from each other; An internal channel 230 installed to extend from the other side plate of the central channel 210 and spaced apart from each other; A connection stiffener 240 which is installed to connect both side plates of the central channel 210 while being continuously connected to the side plate of the channel 23 in the side plate of the connection channel 220; An end plate 250 provided with a plate surface that is the same as or wider than the end of the inner channel 230 and installed to close the end of the inner channel 230; The first stud 260 is protruded and bonded to the end plate 250; is made while installing a twig-shaped steel frame 200 consisting of, The step (f) is made while placing the slab concrete 162 around the end plate 250 of the branched steel frame so that the first stud 260 of the branched steel frame is embedded, The step (h) is made by continuously reinforcing the wall reinforcement 181 through the empty space between the connection channel 220 and the inner channel 230 of the twig-shaped steel frame and pouring the wall concrete 182 Reverse punching method using twig-shaped steel frame by the channel. It is a reverse drilling method that constructs the underground part of the building by excavating while supporting the earth pressure directly to the underground part of the building. (a) constructing the mud wall 110, and constructing the inner pillar 120 into the mud wall 110; (b) excavating the inner ground of the retaining wall 110 and fixing the bracket 130 to the retaining wall 110; (c) the bracket 130 is installed while mounting the bracket 140 to connect with each other on the bracket 130, the mounting beam 140 is located inside the basement outer wall 180 to be constructed in the following (h) step Installing to enable; (d) Installing the inner horizontal beam (150a) to connect the inner column (120) with each other, connect the outer horizontal beam (150b) facing the earth wall 110 to the inner column (120) and mounting beam 140 Installing while mounting on; (e) installing the twig-shaped steel frame 200 assembled with a channel member having both side plates and a bottom plate on the outer horizontal beam 150b; (f) Constructing the slab 160 while placing the slab concrete 162 on the inner horizontal beam 150a and the outer horizontal beam 150b, but continuously from the twig steel frame 200 to the slab 160 Constructing to carry; (g) repeating steps (b) to (f); (h) reinforcing the wall reinforcement 181 through the empty space between the tree-shaped steel frame 200 and constructing the outer wall 180 while pouring the wall concrete 182; The step (e) is mounted on the outer horizontal beam (150b) is installed in the center channel (12) while being located in the cross section of the underground wall (180) to be constructed in step (h) to be continuously connected along the retaining wall 110 ( 210); A connection channel 220 installed to connect one side plate and the retaining wall 110 of the central channel 210 and spaced apart from each other; It is installed while extending from the other side plate of the central channel (210) and the internal channel (230) spaced apart from each other; is made while installing a twig-shaped steel frame 200, In the step (f), the slab concrete 162 is poured into the central channel 210 and the inner channel 230 in the twig-shaped steel frame 200, and the slab is selectively disposed in the connection channel 220. Is made while pouring concrete 162, The step (h) is made by continuously reinforcing the wall reinforcement 181 through the empty space between the connection channel 220 and the inner channel 230 of the twig-shaped steel frame and pouring the wall concrete 182 Reverse punching method using twig-shaped steel frame by the channel. It is a reverse drilling method that constructs the underground part of the building by excavating while supporting the earth pressure directly to the underground part of the building. (a) constructing the mud wall 110, and constructing the inner pillar 120 into the mud wall 110; (b) excavating the inner ground of the retaining wall 110 and fixing the bracket 130 to the retaining wall 110; (c) the bracket 130 is installed while mounting the bracket 140 to connect with each other on the bracket 130, the mounting beam 140 is located inside the basement outer wall 180 to be constructed in the following (h) step Installing to enable; (d) Installing the inner horizontal beam (150a) to connect the inner column (120) with each other, connect the outer horizontal beam (150b) facing the earth wall 110 to the inner column (120) and mounting beam 140 Installing while mounting on; (e) installing the twig-shaped steel frame 200 assembled with a channel member having both side plates and a bottom plate on the outer horizontal beam 150b; (f) Constructing the slab 160 while placing the slab concrete 162 on the inner horizontal beam 150a and the outer horizontal beam 150b, but continuously from the twig steel frame 200 to the slab 160 Constructing to carry; (g) repeating steps (b) to (f); (h) reinforcing the wall reinforcement 181 through the empty space between the tree-shaped steel frame 200 and constructing the outer wall 180 while pouring the wall concrete 182; The step (e) is mounted on the outer horizontal beam (150b) is installed in the center channel (12) while being located in the cross section of the underground wall (180) to be constructed in step (h) to be continuously connected along the retaining wall (110) 210); A connection channel 220 installed to connect one side plate and the retaining wall 110 of the central channel 210 and spaced apart from each other; An internal channel 230 installed to extend from the other side plate of the central channel 210 and spaced apart from each other; An end plate 250 provided with a plate surface that is the same as or wider than the end of the inner channel 230 and installed to close the end of the inner channel 230; The first stud 260 is protruded and bonded to the end plate 250; is made while installing a twig-shaped steel frame 200 consisting of, In the step (f), the slab concrete 162 is poured into the central channel 210 in the tree-shaped steel frame 200, and the slab concrete 162 is selectively poured into the connection channel 220. In addition, the first stud 260 is embedded while placing the slab concrete 162 to the border of the end plate 250 of the twig-shaped steel frame, The step (h) is made by continuously reinforcing the wall reinforcement 181 through the empty space between the connection channel 220 and the inner channel 230 of the twig-shaped steel frame and pouring the wall concrete 182 Reverse punching method using twig-shaped steel frame by the channel. The method of claim 2 or 3, The step (e), the form-tied 280 is installed to connect both side plates of the central channel 210 while floating in the bottom plate of the central channel 210; It is made while installing the frame 200, The step (f) is a reverse punching method using a twig-shaped steel frame by the channel, characterized in that the slab concrete 162 is poured so that the form tie 280 of the twig-shaped steel frame is embedded. The method according to any one of claims 1 to 3, The step (e) is made while installing the twig-shaped steel frame 200 further comprises; a second stud 270 that is bonded to protrude in or out of the central channel 210, The step (h) is a reverse punching method using a twig-shaped steel frame by the channel, characterized in that the wall concrete 182 is poured so that the second stud 270 of the twig-shaped steel frame is embedded. In claim 5, The second stud 270 of the twig-type steel frame, bolt type, plate type, lath type, the reverse drilling method using a twig-type steel frame by the channel, characterized in that provided. The method according to any one of claims 1 to 3, In the step (e), the other side plate of the central channel 210 is made while installing a twig-shaped steel frame 200 is provided at a lower height than one side plate, Step (f), the slab reinforcing bar 161 is made through the channel, characterized in that the reinforcement to reach the inside of the central channel 210 beyond the other side plate of the central channel 210 of the twig-shaped steel frame Reverse punching method using branched steel frame.

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