KR20100100193A - Form system for constructing rc-girder in rc top down method and the rc top down method using the same - Google Patents

Abstract

PURPOSE: A form system for an RC beam construction in an RC top-down construction manner and an RC top-down construction method are provided to mount a slab form and facilitate installation and dismantlement. CONSTITUTION: A form system for an RC beam construction in an RC top-down construction manner comprises a joint form(200) and a connection form(300). The joint form is for forming a joint part of an RC beam and a center part(111) of a composite column. The joint form is attached to and detached from the center part of the composite column. The connection form is for forming the RC beam. The connection form is installed in order to connect the joint forms.

Description

Form system for constructing RC-girder in Rc reinforcement method and Rc reversal method using same {form system for constructing RC-girder in RC top down method and the RC top down method using the same}

The present invention relates to a technology related to the RC reverse drilling method, and more specifically, to form a stable and support frame, and at the same time can be mounted slab formwork, but simply configured to easily install and dismantle the RC beam construction formwork system And it is related with the RC reverse drilling method which used this formwork system preferably.

Top down method is the method of constructing the underground part of the building from top to bottom. It is possible to shorten the air by the underground work and the ground work in parallel, and it is a method that is mainly spotlighted as the underground work in the city because of the low noise and vibration.

In the reverse drilling method, the construction of interlayer structures (beams and slabs) in the basement of the building with reinforced concrete structures is the RC reverse drilling method. In the RC reverse drilling method, construction work such as installation of shells and formwork is essential. In other words, the RC reverse drilling method is usually performed after the ground is excavated, and the concrete is installed after installing the clubbing and the formwork or the slab formwork in the state of selecting the pit. However, this method requires a lot of construction work because it is necessary to perform floor leveling work for stable installation of the club, and it is necessary to repeatedly install and dismantle the club for each floor. To improve this, a suspension RC reverse drilling method was developed.

Suspended RC reversal method is a method of constructing a repetitive interlayer structure by moving the formwork or slab formwork to the suspension material instead of building the bridge, moving the formwork down with the support frame. to be. Such suspension RC reverse drilling method has a disadvantage that it cannot be used for the construction of the interlayer structure of the first floor because the interlayer structure of the construction state must be used for hanging the suspension material. In order to improve this, RC reverse drilling method with bracket support method was developed.

RC reverse drilling method of bracket support method is to fix the bracket to the pillar and to install the support frame on the bracket so that the pillar is supported by the support frame and the bracket. It is a method to construct a repetitive interlayer structure while moving down with the frame and bracket. The RC reverse boring method of the bracket supporting method is such that the construction load is supported by the column while the supporting frame load during the descent is supported by the suspension material.

Figure 1 shows a support frame system (support frame + bracket) used in the RC reverse drilling method of the bracket support method. As you can see, the RC reversing method of bracket support type requires a bracket and support frame with a complicated structure as a temporary material separate from the formwork. In addition, bracket-supported RC reverse drilling has used complex formwork such as formwork panels, joists, and yokes. As described above, the RC reverse boring method of the bracket supporting method has a disadvantage in that a large number of installation materials and a large amount of work materials are required because the boring die, bracket, and support frame must be prepared and installed separately.

The present invention was developed in order to improve the RC beam construction problem in the conventional RC reverse drilling method as described above, it is a formwork for the RC beam construction formwork at the same time a stable support frame and easy to install and dismantle and further mount the slab formwork There is a technical challenge in providing a system.

In addition, the present invention has a technical problem to provide a formwork system for RC beam construction with improved rate of utilization.

In addition, the present invention has a technical problem to provide an RC reverse drilling method that improved construction and economical efficiency while minimizing the construction work.

In order to solve the above technical problem, the present invention provides a formwork system and RC reverse drilling method for RC beam construction in the RC reverse drilling method having the following technical features.

The RC beam construction formwork system in the RC reverse drilling method according to the present invention, the composite pillar in which the RC portion is formed around the center portion by steel frame, CFT, PC and the underground structure designed by RC beam by the reverse drilling method Formwork system for constructing RC beams before constructing RC part of composite column after constructing the center part of composite column. Formwork for forming joints of RC part and RC beam of composite column. Joining formwork consisting of side plates; and Formwork for forming RC beams, connecting formwork consisting of a connecting bottom plate and a connecting side plate and a horizontal wing; characterized in that comprises a.

RC reverse drilling method according to the present invention, a method for constructing the underground portion of the building by the RC reverse drilling method using the above-described RC beam construction formwork system, comprising the steps of: (a) constructing a wall; (b) planning a synthetic column in which the RC portion is formed around the center portion by steel frame, CFT or PC as an inner pillar and constructing the center portion of the synthetic pillar in the earth wall; (c) excavating the ground within the retaining wall; (d) installing the formwork system for RC beam construction at the RC beam construction position while mounting the support bracket of the joining formwork to the center portion of the composite column; (e) RC beams are installed by placing reinforcement reinforcement inside the RC beam construction formwork and placing bocon concrete, while installing slab formwork on the horizontal wing of RC beam construction formwork, and placing slab concrete. Constructing; (f) repeating steps (c) to (e); (g) constructing the RC column of the composite pillar while placing the pillar reinforcement around the center portion of the composite pillar and placing the pillar concrete to complete the composite pillar; but in the step (f), (d) The step is characterized in that the support bracket of the joint formwork is removed from the center of the composite column while lowering the formwork system for RC beam construction to the construction position of the RC beam construction downstairs.

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

First, since the formwork system according to the present invention integrates the formwork and the support frame, it is easy to install and manage due to the small number of materials as a whole. Accordingly, the overall construction and economic efficiency can be simultaneously improved in performing the RC reverse boring method. have.

Secondly, since the formwork system according to the present invention will be composed of a joint formwork corresponding to each structural form of the one-way or two-way frame and a connecting formwork irrelevant to the structural form of the one-way or two-way frame, to change the junction formwork If only the connection formwork is used as it is, it can be applied while appropriately responding to the 1,2-way frame structure type, thereby improving the formwork rate.

Third, the formwork system according to the present invention can withstand the concrete side pressure stably because the formwork soon becomes a support frame, thereby minimizing the phenomenon such as the mold bursting or hungry in the process of placing concrete, it is overall uniform and Also excellent construction quality can be secured.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. However, the present invention proposes the formwork system for RC beam construction and this formwork system with respect to the RC reverse drilling method, and looks at them separately.

1. Formwork system for RC beam construction

Formwork system according to the present invention, the construction of the underground structure designed by the composite column 110 and RC beam 120 is formed by the RC section 112 around the center portion 111 by the steel frame or CFT or PC by reverse drilling method As a formwork system for constructing the RC beam 120 prior to the construction of the RC part 112 of the composite pillar after the construction of the center portion 111 of the synthetic pillar in the ship, it is configured to be a formwork and at the same time stable support frame On the other hand there is a technical feature that it is simply configured to facilitate installation and disassembly, and furthermore it is possible to mount the slab formwork.

Formwork system according to the present invention is composed of a junction formwork 200 and the connection formwork (300). Joining formwork 200 is a formwork for forming a joining portion of the center portion 111 and the RC beam 120 of the composite pillar, is a configuration that is detachably installed in the center portion 111 of the composite pillar. The connection formwork 300 is a formwork for forming the RC beam 120, the junction formwork 200 is configured to be connected to each other. As the joint formwork 200 is installed in the center portion 111 of the composite pillar and the junction formwork 200 is connected by the connection formwork 300, the construction load of the RC beam 120 is connected to the connection formwork 300 and the junction part. While being supported by the internal strength of the formwork 200 is transferred to and supported by the center portion 111 of the composite pillar. Furthermore, the connection die 200 is configured to be mounted on the slab formwork, and the junction die 100 may also be configured to be mounted on the slab formwork.

2 and 3 show embodiments of the formwork system according to the present invention, shown separately according to the structure type. Figure 2 is an example of the formwork system for the one-way frame for the construction of the RC beam 120 in one direction, the connection formwork 300 is installed in one direction, Figure 3 is the RC beam 120 in two directions The linkage formwork 300 is installed in two directions as a formwork system for a two-way frame proposed for construction. As shown, the one-way frame and the two-way frame is the same in the installation form of the connection formwork 300, there is a difference in the junction formwork 200, where the connection formwork 300 is mounted, is the same as a whole.

Figure 4 shows the junction formwork 200 in a one-way frame formwork system, Figure 5 shows the junction formwork 200 in a two-way frame formwork system. The joint formwork 200 in the formwork system according to the present invention, which is for any structural form comprises a junction bottom plate 210, a support bracket 220 and a junction side plate 230, but only in the structural form Accordingly, the specific shape of the junction side plate 230 is only changed. Joining formwork 200 is preferably composed of structural steel that exhibits sufficient strength to withstand the construction load itself.

In the junction die 200, the junction bottom plate 210 is a plate-shaped member having a plate surface wider than the cross section of the center portion 111 of the composite pillar, and an opening 211 through which the center portion 111 of the composite pillar passes through the center portion is formed. It is a structure provided to be formed. The junction bottom plate 210 may be surrounded by the center portion 111 of the composite pillar by the opening 211. The joint bottom plate 210 serves as a form plate forming the bottom surface of the end of the RC beam 120 (the end constituting the joint portion with the center portion of the composite pillar), and also the connection bottom plate of the connection form to be described later It serves as a cradle for mounting (310), and further serves as a medium for constraining and connecting the support brackets 220, which are separated from each other in four shapes.

On the other hand, the opening portion 211 of the junction bottom plate should be the same as the cross section of the center portion 111 of the composite column will be able to serve as a form plate while the junction bottom plate 210 surrounds the center portion 111 of the composite pillar. . However, if the opening 211 of the joint bottom plate is the same as the cross section of the center portion 111 of the composite column, it is difficult to flexibly cope with various situational changes. Accordingly, the present invention proposes to form the opening 211 of the junction bottom plate larger than the center portion 111 of the composite pillar, but when the junction bottom plate 210 is installed at the center portion 111 of the composite pillar. Since the opening part 211 may be partially opened and concrete pouring may be difficult, it is proposed to use the wire mesh base plate 250 together. That is, the part that is partially opened in the opening 211 of the joint bottom plate is covered with the wire mesh bottom plate 250 to enable concrete pouring. Since the wire mesh base plate 250 makes the concrete pour surface rough, it plays an advantageous role in strengthening the integrity when constructing the RC portion 112 of the composite column later.

In the joint formwork 200, the support brackets 220 are arranged in a + -shape, leaving four empty spaces for passing the center portion 111 of the composite pillar in the center to form a junction bottom plate (below the junction bottom plate 210). 210 is installed to support, all of the four arranged in a + -shaped or only a pair facing each other will be detachably installed in the center portion 111 of the synthetic column. When the support bracket 220 is mounted on the center portion 111 of the synthetic pillar, the formwork system according to the present invention is stably positioned as a support frame serving as a formwork, and the support bracket 220 is the center portion 111 of the synthetic pillar. When dropped from the formwork system according to the invention will have mobility. Desorption of the support bracket 220 may be treated by bolt assembly method. In particular, the support bracket 220 serves to transfer the construction load to the center portion 111 of the synthetic pillar in a state mounted on the center portion 111 of the synthetic pillar. 4, 5, and 15 illustrate an example in which H-shaped steel is adopted as the support bracket 220, but a plate or the like may be adopted instead of H-shaped steel.

In the junction part die 200, the junction part side plate 230 is a plate-shaped member vertically mounted on the junction part bottom plate 210, and is a structure provided corresponding to the construction direction of the RC beam 120. As shown in FIG. Since the junction side plate 230 corresponds to the construction direction of the RC beam 120, when the RC beam 120 is constructed in one direction, the junction side plate 230 is provided in parallel on both sides as shown in FIG. If the RC beam 120 is constructed in two directions, the junction side plate 230 is provided while forming an inconor at four corners as shown in FIG. 5. Furthermore, in Figure 4, the horizontal blade 240 is further provided horizontally outward from the junction side plate 230, the horizontal blade 240 of the junction die will be seated horizontal blade 340 of the connecting die to be described later, In addition, the horizontal wing 240 of the joint formwork may be a cradle in which the slab formwork is mounted in the same manner as the horizontal wing 340 of the connection formwork.

Although not shown, the junction die 200 as described above is preferably provided by the assembly of the left segment and the right segment (similar to the assembly of the connection die in Figure 12), which is the junction die 200 to the center of the composite pillar This is for easily separating and removing the portion 111.

6 to 13 show various embodiments of the connecting formwork 300 in the formwork system according to the present invention, the connecting formwork 300 is a two-way frame for two-way regardless of the structure type, unlike the junction formwork 200 The same applies to directional framing. In the formwork system according to the present invention, the connection formwork 300 is configured to include a connection bottom plate 310, a connection side plate 330 and a horizontal wing 340, these components are integrally provided as well as appropriate assembly It may be provided in a form. The connection formwork 300 is preferably composed of structural steel exhibiting sufficient strength to withstand the construction load itself.

In the connection formwork 300, the connection bottom plate 310 is a plate-shaped member provided to form the bottom surface of the RC beam 120, mounted on the junction bottom plate 210 of the junction formwork, the junction bottom plate 210 mutually This is the configuration to connect. The connection side plate 330 in the connection die 300 is a plate-shaped member placed on both sides of the connection bottom plate 310 to form a side of the RC beam 120, the junction side plate 230 of the junction die It is arranged to be in contact with the junction side plate 230 is a configuration that connects each other. In the connecting die 300, the horizontal wing 340 is configured to be provided horizontally outward from the connecting side plate 330, the horizontal wing 340 is a cradle for mounting the slab bottom plate.

6 shows an example in which the horizontal blade 340 extends from the upper side of the connecting side plate 330 to the connection die 300 of the basic type, and FIGS. 7 and 8 show the construction of the RC beam 120 in low dance. In contrast, in the connection form 300 of the basic type shows an example of changing the position of the connecting bottom plate 310 and the horizontal wing 340, respectively.

9 to 11 show an example in which a reinforcing means is further provided as an example of a modification of the connection die of the basic type, and the reinforcing means is provided in such a manner as to increase the strength to control the deflection due to the construction load. 9 is an example in which the U-shaped reinforcement 351 is installed in the lower surface of the connection bottom plate 310 along the longitudinal direction of the connection bottom plate 310, and FIG. 10 is a horizontal wing 340 and a connection side plate ( The reinforcing rib 352 is installed to reinforce the 330 to be connected, and FIG. 11 is a connecting side plate 330 and a connecting bottom plate 310 while leading from the connecting side plate 330 to the connecting bottom plate 310. It is an example of reinforcing by installing the reinforcing band (353) padded on the outer circumference of the. As the reinforcing means, the U-shaped reinforcing table 351, the reinforcing rib 352, and the reinforcing band 353 may be provided in combination with each other.

자 단면을 가지는 좌측 세그먼트(300a)와

자 단면을 가지는 우측 세그먼트(300b) 및

자 단면을 가지는 가운데 세그먼트(300c)를 적절히 조합하여 완성할 수 있다. 즉, 좌·우측 세그먼트(300a, 300b)만으로 조립하거나, 좌·우측 세그먼트(300a, 300b)와 적절한 개수의 가운데 세그먼트(300c)를 조립하는 것이다. 각 세그먼트(300a, 300b, 300c)의 조립은 서로 맞닿는 하부 수직부분에서 이루어지 게 되며, 이 조립부분은 일종의 보강대가 될 것이다. 특히, 도 12에서와 같이 각 세그먼트(300a, 300b ,300c)가 하부에서 내향하게 수평 연장된 수평리프(L)가 더 마련된 것이라면, 각 세그먼트의 조립으로 연결바닥판(310) 하부에 ⊥자형 보강대(351)가 자연스럽게 마련된다. Figure 12 shows a prefabricated connecting formwork 300, the prefabricated connecting formwork 300

The left segment 300a having a ruler cross section

Right segment 300b having a child cross section and

The center segment 300c having a ruler cross section can be appropriately combined and completed. That is, the left and right segments 300a and 300b are assembled only, or the left and right segments 300a and 300b and an appropriate number of center segments 300c are assembled. The assembly of each segment (300a, 300b, 300c) will be made in the lower vertical portion in contact with each other, this assembly will be a kind of reinforcement. In particular, as shown in Figure 12, if each segment (300a, 300b, 300c) is further provided with a horizontal leaf (L) extending horizontally inwardly from the bottom, the U-shaped reinforcement on the bottom of the connecting bottom plate 310 by the assembly of each segment 351 is naturally provided.

Figure 13 shows the connection formwork 300 cut off the end of the horizontal blade 340, which is a form proposed for application to the formwork system for two-way framework. In other words, since the formwork system for the two-way frame is installed while forming the connecting die 300 in two directions (see Fig. 3), the horizontal blades 340 of the connecting formwork at the corner may interfere with each other, and thus interfere with this. In order to block the problem in advance, the end of the horizontal blade 340 is cut.

2. Unsupported reverse punching method

14 and 15 illustrate the RC beam 120 construction step and the descending step of the RC beam construction formwork system, respectively, in the RC reverse drilling method according to the present invention. Hereinafter, the RC reverse drilling method according to the present invention will be described with reference to these drawings. Explain step by step.

Step (a): construct the wall

Construct a wall of mud walls in line with the construction line. The retaining wall can be constructed with H pile, earth plate, CIP, SCW, sheet pile, etc. as well as underground continuous wall (slurry wall).

Step (b): construction of the center part of the composite column

As the inner pillar to be a part of the underground structure, the composite pillar 110 is formed around the center portion 111 by the steel frame, CFT or PC, and the composite pillar 110 is formed. 111) Install. The construction of the center portion 111 of the composite column is the same as in the reverse drilling method. 14 shows an example in which the center portion 111 of the composite pillar is constructed of H-beams.

(c) step; Gulto

Excavate the ground inside the retaining wall. The pit depth is carried out considering the stable support of the retaining wall.

Step (d): Formwork System for RC Beam Construction

While mounting the support bracket 220 of the joint formwork to the center portion 111 of the composite column to install the formwork system for RC beam construction at the construction position of the RC beam 120. Installation of the formwork system for RC beam construction, the support bracket 220 is inserted into the center portion 111 of the composite pillar through the opening 211 of the joint bottom plate in the state in which the joint formwork 200 is prepared, and then the support bracket 220 is centered on the composite pillar. Attached to the portion 111 to install the junction die 200, and then proceed to the process of mounting the connection die 300 mounted on the junction die (200).

Step (e): Construction of RC Beams and Slabs

After the RC beam construction formwork system is installed, the RC beams 120 are constructed while reinforcing the reinforcement in the RC beam construction formwork system and placing the bocon concrete. The construction load received by the RC beam formwork system is transferred to and supported by the center portion 111 of the composite pillar through the support bracket 220. By performing this step, the RC beam 120 is completed while surrounding the center portion 111 of the composite pillar and connecting the center portion 111 of the composite pillar to each other, whereby the RC beam 120 and the earth wall By connecting the center portion 111 of the synthetic pillar is a brace for supporting the earth wall. Considering the role of the soil barrier of the RC beam 120 as described above, by providing a stud 142 in the center portion 111 of the composite pillar, the integrity of the center portion 111 and the RC beam 120 of the composite pillar It is desirable to strengthen. In FIG. 14 and FIG. 15, it is possible to confirm a state in which the studs 142 are bonded to the reinforcing plates 141 connecting the two flanges and the two flanges of the H-shaped steel constructed by the center portion 111 of the composite column.

In addition, in this step, the construction of the slab 130 in addition to the construction of the RC beam 120, the slab 130 is integrated with the RC beam 120 to support the retaining wall. Slab construction is installed by mounting the slab formwork on the horizontal wings (240, 340) of the formwork system for RC beam construction, and proceed with the process of placing the slab concrete, if necessary reinforce the slab reinforcement. In slab construction, the slab formwork can adopt not only the removable formwork that demolds and removes after slab concrete casting, but also the permanently positioned formwork that permanently retains, such as iron plate decks, and also the state in which the slab reinforcement is assembled. . Of course, slab construction can be carried out at the same time with RC beam construction and reinforcement and concrete placement.

Step (f): Repeat

Steps (c) to (e) are repeated. In other words, by repeating the construction process of the gulto and RC beam 120 and the slab 130 to complete the interlayer structure of the underground structure. However, step (d) in this step is dropping the support bracket 220 of the joint formwork from the center portion 111 of the composite pillar while lowering the formwork system for RC beam construction to the construction position of the lower beam RC beam 120 Do it. Only then can the RC beam formwork system be repeatedly converted. On the other hand, if the slab formwork adopts the removable formwork, the slab formwork is demoulded and lowered like the RC beam construction formwork. If the slab formwork adopts the permanent zone type formwork, the slab formwork lowers the formwork for the RC beam construction. At the same time, a new slab formwork is installed at the lowered position.

The descent of the formwork system for RC beam construction in this step can be applied to the suspension method, specifically, the support bracket 220 of the joint formwork is suspended from the center portion 111 of the composite column in the suspended state with the suspension member 150. And lowering the suspension bracket 150 while lowering the support bracket 220 of the joint formwork to lower the formwork system for RC beam construction to the construction position of the RC beam 120 downstairs. In this case, however, the construction of the RC beams 120 is planned so that the suspension material 150 is not bound to the RC beams 120. For example, if the center portion 111 of the composite column is constructed of H-shaped steel, as shown in Figure 15, after connecting both flanges of the H-shaped steel to the reinforcement plate 141, the suspension member 150 is the web and the reinforcement plate (H-shaped steel ( Plan to pass through the space between them. Although not shown, a sleeve or the like may be appropriately used.

After completing the interlayer structure of the underground structure through this step, the formwork system for RC beam construction is removed.

Step (g): complete the composite column

Simultaneously or sequentially with step (f), the RC portion 112 of the synthetic column is constructed. In other words, while constructing the RC column 112 of the synthetic pillar while placing the column reinforcement around the center portion 111 of the synthetic pillar and placing the pillar concrete, the synthetic pillar 110 is completed.

Since the RC beam 120 to the slab 130 have already been constructed around the center portion 111 of the composite pillar, the RC portion 112 of the composite pillar is separated from each other by the bar, and the RC beam 120 is constructed in advance. The countermeasure for interlayer integration of the RC part 112 of the pillar is prepared. For example, in order to continually reinforce column reinforcing bars, the reinforcing bars are pre-arranged or rebar couplers are purchased in advance.

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.

Figure 1 shows a formwork supporting frame commonly used in the conventional RC reverse drilling method.

Figure 2 shows a state in which one-way frame is installed as an embodiment of the 'RC beam construction formwork system in RC reverse drilling method' according to the present invention.

Figure 3 illustrates a two-way frame as another embodiment of the 'RC beam construction formwork system in RC reverse drilling method' according to the present invention.

Figure 4 shows the joint formwork and the installation state of the one-way frame applied to the RC beam construction formwork according to FIG.

Figure 5 shows the joint formwork for two-way framework applied to the RC beam construction formwork according to FIG.

6 to 13 show various embodiments of the connection formwork applied to the formwork system for RC beam construction according to FIGS. 2 and 3.

Figure 14 shows an RC beam construction step in the RC reverse drilling method according to the present invention.

Figure 15 shows the descending stage of the formwork system for RC beam construction in the RC reverse drilling method according to the present invention.

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

110: composite column

111: center part

112: RC part

120: RC beam

130: slab

141: gusset

142: stud

150: Suspension

200: junction die

210: junction bottom plate

220: support bracket

230: junction side plate

300: connecting die

310: connecting bottom plate

330: connecting side plate

340: horizontal wing

Claims (10)

The center part of the composite column in the construction of the underground structure designed by the composite pillar 110 and RC beam 120 formed with the RC section 112 around the center section 111 by steel, CFT or PC by reverse drilling method ( As a formwork system for the construction of the RC beam 120 before the construction of the RC section 112 of the composite pillar after the construction of 111), Formwork for forming the junction of the center portion 111 and the RC beam 120 of the composite column, the junction formwork 200 is installed in the center portion 111 of the synthetic column; And, Formed to form RC beams 120, the connection dies 200, the connection formwork 300 is installed to connect with each other; configured to include, The junction die 200, A plate-shaped member having a plate surface wider than a cross section of the center portion 111 of the composite pillar, the junction part bottom plate 210 having an opening 211 through which the center portion 111 of the composite pillar passes; The four are arranged in a + shape while leaving an empty space for passing the center portion 111 of the composite pillar in the center, and are installed to support the junction bottom plate 210 under the junction bottom plate 210, and face or face each other. Only one pair of support brackets 220 to be detachably installed in the center portion 111 of the synthetic pillar; The plate-shaped member vertically placed in the junction bottom plate 210, junction side plate 230 provided corresponding to the construction direction of the RC beam 120; configured to include, The connecting die 300, A plate-shaped member provided to form a bottom surface of the RC beam 120, the connection bottom plate 310 mounted on the junction bottom plate 210 of the junction part die to connect the junction bottom plate 210 to each other; A plate-shaped member vertically installed at both sides of the connecting bottom plate 310 to form a side surface of the RC beam 120, and is disposed in an indirect contact with the junction side plate 230 of the joint formwork, the junction side plate 230 mutually Connection side plate 330 to be connected; The formwork system for RC beam construction in the RC reverse drilling method, characterized in that consisting of; comprising; horizontal wing (340) provided horizontally outwardly from the connecting side plate (330). In claim 1, The junction bottom plate 210 of the junction die is an opening 211 is formed larger than the center portion 111 of the composite pillar, so that the junction die 200 is installed in the center portion 111 of the composite pillar Part of the opening 211 will be partially opened, The junction die 200, Formwork system for RC beam construction in the RC reverse drilling method, characterized in that it further comprises; wire mesh bottom plate 250 covering a part of the opening portion 211 of the junction bottom plate. In claim 1, The junction side plate 230 of the junction die, Are parallel to both sides, Formwork system for RC beam construction in RC reverse drilling method, characterized in that it is prepared by forming the in-corner at four corners. In claim 1, The joining formwork 200 is a formwork system for RC beam construction in the RC reverse drilling method, characterized in that provided by the assembly of the left segment and the right segment. In claim 1, The connecting die 300, A U-shaped reinforcement 351 installed along the longitudinal direction of the connection bottom plate 310 on the bottom surface of the connection bottom plate 310; Reinforcing rib 352 is installed to connect the horizontal blade 340 and the connecting side plate 330; A reinforcing band 353 padded on the outer circumference of the connection side plate 330 and the connection bottom plate 310 while leading from the connection side plate 330 to the connection bottom plate 310; Formwork system for RC beam construction in RC reverse drilling method, characterized in that it comprises one or more of more. In claim 1, The connecting die 300,

The left segment 300a having a ruler cross section

It is provided by the assembly of the right segment 300b having a ruler cross section,

The left segment 300a having a ruler cross section

Middle segment 300c having a child cross section and

Formwork system for RC beam construction in the RC reverse drilling method, characterized in that provided by the assembly of the right segment 300b having a ruler cross section. In claim 6, Each segment (300a, 300b, 300c) constituting the connecting die 300 is further provided with a horizontal leaf (L) extending horizontally inwardly from the bottom so that the connecting bottom plate 310 of the connecting die 300 each segment (300a) , 300b, 300c) formwork system for RC beam construction in the RC reverse drilling method, characterized in that the U-shaped reinforcement 351 is provided in the lower portion. As a method of constructing the underground part of the building by RC reverse drilling method using the formwork system for RC beam construction according to any one of claims 1 to 7, (a) constructing a retaining wall; (b) planning the synthetic column 110, the RC portion 112 is formed around the center portion 111 by the steel frame, CFT or PC as an inner pillar, and the center portion 111 of the synthetic pillar inside the retaining wall Construction step; (c) excavating the ground within the retaining wall; (d) installing the formwork system for RC beam construction at the construction site of the RC beam 120 while mounting the support bracket 220 of the bonded formwork to the center portion 111 of the composite pillar; (e) Installing the RC beam 120 while placing the reinforcement bar inside the RC beam construction formwork and placing the bore concrete, while installing the slab formwork on the horizontal wing 340 of the RC beam construction formwork system. Constructing the slab 130 while pouring slab concrete; (f) repeating steps (c) to (e); (g) constructing the RC column 112 of the synthetic pillar while placing the pillar reinforcement around the center portion 111 of the synthetic pillar and placing the pillar concrete to complete the synthetic pillar 110; Step (d) in the step (f) dropping the support bracket 220 of the joint formwork from the center portion 111 of the composite column while lowering the formwork system for RC beam construction to the construction site of the lower beam RC beam 120 RC reverse drilling method using the formwork system for RC beam construction, characterized in that made. In claim 8, Step (d) in the step (f), while the support bracket 220 of the joint formwork suspended from the suspension member 150 in the center portion 111 of the synthetic column while lowering the suspension member 150 RC reverse drilling method using the formwork system for RC beam construction, characterized in that the formwork system for RC beam construction is lowered to the construction site of the RC beam construction as the support bracket 220 of the joint formwork is lowered. The method of claim 9, The step (b) is made while constructing the center portion 111 of the synthetic column in H-beam, Step (e) is made in a state in which both flanges of the H-beams at the construction position of the RC beam 120 are connected to the reinforcing plate 141, Step (d) in the step (f) is characterized in that the suspension member 150 is made in the state of hanging the support bracket 220 of the joint formwork through the space between the web and the reinforcement plate 141 of the H-shaped steel RC reverse drilling method using formwork system for RC beam construction.

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