KR102582018B1 - Steel beam reverse punching method using embedded edge beam at the end of steel beam - Google Patents

Abstract

The present invention relates to a reverse drilling method for constructing an underground building with a steel beam structure while supporting a back surface earth pressure of an earth retaining wall with an edge beam of a reinforcing bar concrete structure and each floor slab integrated into the earth retaining wall. The earth retaining wall is built. Afterwards, excavation is made to maintain a repose angle, exposing a portion of the earth retaining wall, and the edge beam of the reinforcing bar concrete structure is constructed on the earth retaining wall. The slab is constructed adjacent to the edge beam. Therefore, the back surface earth pressure of the earth retaining wall is supported by the slab. Each step of the above-mentioned excavation, the edge beam, and slab construction is repeated to construct the underground building. The edge beam is constructed so that an end part of a steel beam supporting a load of the slab is embedded.

Description

Steel beam reverse punching method using embedded edge beam at the end of steel beam {STEEL BEAM REVERSE PUNCHING METHOD USING EMBEDDED EDGE BEAM AT THE END OF STEEL BEAM}

The present invention relates to a reverse drilling method of constructing a structure in the reverse direction from the first floor to the lower floor when constructing the underground part of a building. More specifically, the present invention relates to an earth retaining wall in which the border beam of the reinforced concrete structure and the slab of each floor are integrated into the earth retaining wall. This relates to the reverse drilling method of constructing an underground building with a steel beam structure while supporting the earth pressure behind the wall.

Unlike the conventional sequential drilling method, which involves constructing underground buildings sequentially from the lower floor to the first floor above ground after completion of excavation, the reverse drilling method (top-down construction method), which involves constructing underground buildings sequentially from the first floor above ground to the lower floor, is used to build underground structures. Construction on buildings and ground structures can be carried out simultaneously, significantly shortening the construction period, allowing the pre-constructed first floor floor to be used as a workshop, and having many advantages, including low noise and vibration and the ability to be constructed even in rainy weather, making it particularly popular in urban areas. It is a construction method.

The reverse drilling method for a steel structure involves constructing an earth retaining wall with CIP piles, etc. in the ground, and then supporting the earth retaining wall with the horizontal structure of each floor while working on the lower layer, such as the excavated soil. Various structural methods are applied depending on the support method.

Figure 1 shows a yoke supported by bars on a partially completed excavation surface connected to and installed on an earth retaining wall such as CIP piles, and a joist and lower formwork are installed on top of the yoke to install a border beam of a reinforced concrete structure, and the border It shows a method of supporting the earth pressure on the back of an earth retaining wall with a steel beam using a beam as a medium. Once the support structure of this retaining wall is established, slab concrete is poured on top of it.

Figures 2 and 3 show a method of not installing the above-mentioned border beam, and Figure 2 is mainly applied only to the first floor so that it can be used as a workshop, and Figure 3 is mainly applied to the basement floor below that.

These are all thumb piles of a CIP retaining wall, and a seat is installed on the CIP steel frame inserted inside, a steel band is partially installed on the upper surface of the seat, and then a steel beam is mounted on the upper surface of the steel band.

However, in the case of Figure 2, slab concrete is poured on the top of the steel beam so that the cured slab can support the back earth pressure of the retaining wall. At this time, openings for reinforcing the vertical reinforcing bars 131 for the exterior wall combined with the retaining wall and pouring concrete for the exterior wall are continuously formed in the area in contact with the retaining wall.

On the other hand, in the case of Figure 3, a wale is installed at the end of the steel beam, and a backfill block is installed between the wale and the CIP steel material, so that the steel beam can support the back earth pressure of the retaining wall through the backfill block and the wale.

However, the earth retaining wall support structure of the conventional technologies related to the steel beam reverse drilling method described above has the following problems.

In the case of counter-punching construction according to Figure 1, the construction process such as installation of braces is cumbersome, and furthermore, in order to connect the steel beam to the border beam, an anchor is installed on the end plate to which a bracket for connecting the steel beam is attached, and the anchor is installed when constructing the border beam. After installing the bracket for connecting the steel beam to the edge beam by embedding it, the end of the steel beam must be bolted to the bracket for connecting the steel beam. If a construction error occurs, the steel beam and the bracket for connecting the steel beam will not match exactly. . Therefore, there was a problem in that the steel beam installation process became complicated and the construction period was delayed due to the actual measurement of the length of the steel beam and installation. In addition, since the border beam is installed in close contact with the retaining wall, the installation work of form ties, etc. on the form for constructing it becomes very cumbersome.

In the case of reverse pouring construction according to Figure 2, not only is there the inconvenience of having to form a plurality of continuous openings in advance when pouring slab concrete, but also the process of transferring stress due to cross-sectional defects caused by the openings between the retaining wall and the slab. There is a problem with this becoming unstable. Furthermore, the steel strips and stands to support the steel beams are all buried when the concrete of the exterior wall is poured, so expensive steel materials are unnecessarily wasted.

In addition, in the case of reverse driving construction according to Figure 3, since the gap between the CIP pile and the wale is not constant, it is not easy to meet the specifications of the backfill block inserted between them, and when the construction of the slab on the upper part of the steel beam is completed, the retaining wall of the retaining wall is not easy. Since the stress due to the back earth pressure is transmitted through an inconsistent path between the backfill block and the slab, the stress transmission is not clear. In this case, the problem is that the construction cost increases due to unnecessary waste of steel embedded in the concrete of the outer wall of the pedestal and steel band. There is.

KR 10-0634726 B1 KR 10-1713674 B1

The present invention is intended to solve the above-mentioned problems of the prior art, and ensures the integrity of the retaining wall by CIP piles, while ensuring high structural stability by clearly transmitting stress to the back earth pressure of the retaining wall. A border beam of a concrete structure is installed, but the constructability is improved by facilitating the installation and disassembly of the formwork structure for this purpose. Even if construction errors occur, such as the verticality of the earth retaining wall being incorrect or the border beam becoming full, the steel beam is installed. The purpose is to improve constructability by making it unnecessary to measure the actual length and set standards, and to provide a reverse drilling method for steel beam structures that enables economical construction by eliminating unnecessary waste of steel materials.

According to the most preferred embodiment of the present invention for solving the above problems, after constructing an earth retaining wall, a portion of the earth retaining wall is exposed by excavating the earth so that the angle of repose is maintained, and a border beam of a reinforced concrete structure is constructed on the earth retaining wall, A slab is built adjacent to the border beam, so that the back earth pressure of the retaining wall is supported by the slab, and each step of the above-described excavation, border beam, and slab construction is repeated to construct an underground building, A steel beam reverse drilling method using a steel beam end-embedded border beam is provided, wherein the edge beam is constructed so that the end of the steel beam supporting the load of the slab is embedded.

At this time, the construction of the border beam involves installing a pedestal on the retaining wall, installing a yoke made of square pipes on the upper surface of the pedestal, and installing a bottom form made of lath or plywood on the upper surface of the yoke. The end of the steel beam is brought inward to be buried inside, placed on the bottom form, and then the reinforcing bar assembly for the border beam is placed. Once the mounting of the end of the steel beam and the placement of the reinforcing bar assembly are completed, the side form is installed on the outside of the bottom form. , Concrete is poured to build border beams and slabs, and when the support structure of the earth retaining wall by the edge beams and slabs is completed, the pedestal and each form are removed and reinstalled on the lower level to recycle the materials. there is.

In addition, both ends of the side form may be fixed by a pair of left and right vertical stiffeners installed at the outer surface of the border beam of the steel beam. It can be fixed by shaped end fixing materials. In the former case, a joint to which the end of the side form is fixed is provided at the outer end of the vertical stiffener, and in the latter case, both ends of the side form are fixed and supported by both sides of the end fixing member.

In addition, a support member to prevent fullness may be installed on the side formwork, and a support pipe may be further installed on the upper surface of the seat outside the lower formwork to securely support this.

The support member is installed between an upper horizontal angle member installed horizontally on the upper part of the side formwork, a lower horizontal angle member installed horizontally at the lower part of the side formwork corresponding to the upper horizontal angle member, and the upper and lower horizontal angle members. It may be composed of a pressurized vertical angle member that pressurizes the side formwork, and a polygonal support piece of Hagwang Commercial Co., Ltd. that supports the pressurized vertical angle member.

The fixing of the support material to the support pipe may be done by fastening means such as a piece, or it may be done by providing a step at the rear edge of the polygonal support piece so that it rests on the edge of the support pipe, and is inserted into the support pipe. It may also be done by forming a groove and inserting the edge of the polygonal support piece into the fitting groove.

Since the present invention has a simple structure in which the end of the steel beam is embedded inside the border beam, the inconvenience of work due to actual measurement of the steel beam is eliminated, and the end of the embedded steel beam is used to facilitate the installation of the side form for building the border beam. It is possible to easily install support materials to prevent fullness by using support pipes on the outside of the side formwork without installing form ties, which are difficult to work with inside the formwork, thereby shortening the construction period.

In addition, the present invention ensures the integrity of the retaining wall by dispersing the stress caused by the back earth pressure of the retaining wall by the border beam, thereby improving the structural stability of the retaining wall itself, and creating a cross section between the retaining wall and the slab to support it. No defects occur, ensuring high stability in the support structure for the retaining wall.

In addition, the present invention enables economical construction without waste of materials because the steel members of the pedestal or wale are recycled rather than buried in the exterior wall.

Figures 1 to 3 are cross-sectional views of the structure supporting the retaining wall in the steel beam reverse drilling method according to the prior art.
Figure 4 is a process diagram of the steel beam reverse drilling method according to the present invention.
Figure 5 is a perspective view of the steel beam installed in the present invention.
Figure 6 is a cross-sectional view of portion AA of Figure 5.
Figure 7 is a plan view of Figure 5.
Figure 8 is an explanatory diagram of the first embodiment of the fixing structure of the end portion of the side form of the present invention.
Figure 9 is an explanatory diagram of a second embodiment of the fixing structure of the end portion of the side form of the present invention.
Figure 10 is a perspective view of the support material of the present invention.
11 to 13 are cross-sectional views of each embodiment of the installation of the above-mentioned support material.
Figure 14 is a cross-sectional view of the retaining wall support state in the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, when explaining the present invention in detail, if the technical idea of the present invention is obscured or unclear, the description of the known configuration will be omitted.

Figure 4 shows the construction flow of the steel beam reverse drilling method according to an embodiment of the present invention, and Figures 5 to 13 show the respective configurations of some structures in the construction process by the steel beam reverse drilling method.

Since the present invention forms an underground continuous wall by continuously constructing piles in the ground, the edge beam 200 is formed on the retaining wall 100 such as CIP, which lacks structural integrity between each pile, thereby forming the retaining wall 100. With the main premise of ensuring structural stability, the aim is to improve the conventional steel beam reverse drilling method so that constructability and materials such as steel can be reduced.

This steel beam reverse drilling method of the present invention. As shown in FIG. 4, steps of constructing an earthen retaining wall 100, excavating the soil so that the angle of repose is maintained with respect to the inside of the earthen retaining wall 100, and exposing a portion of the earthen retaining wall 100, the earth retaining wall 100 Installing a support structure for the form for constructing the edge beam 200, such as the pedestal 111, on the exposed surface of (100), installing the bottom form 113 on the support structure, and installing the steel beam 120 and the border beam. Installing the reinforcing bar assembly 130 for (200); Installing the side formwork (114); After mounting the form or deck for the slab 300 on the upper surface of the steel beam 120, pouring concrete for the edge beam 200 and the slab 300; By curing the concrete of the edge beam (200) and the slab (300) to build a border beam (200) of a reinforced concrete structure on the retaining wall (100), and constructing a slab (300) connected to the edge beam (200) , ensuring that the back earth pressure of the retaining wall 100 is supported by the slab 300; Dismantling the support structure of the formwork; Completing the construction of the horizontal structure up to the lowest floor by repeating each step from the excavation to dismantling the support structure of the form, such as building the above-mentioned excavation, border beam 200, and slab 300; It consists of the step of pouring the outer wall on the retaining wall 100 in order from the lowest floor and joining the wall.

At this time, in the present invention, when installing the steel beam 120 supporting the load of the slab 300, the end is buried inside the edge beam 200, unlike the conventional installation on the outer surface of the edge beam 200. Significantly improves the constructability and structural integrity of the steel beam (120) installation. Figures 5 to 7 show the explanation of this, and Figure 5 shows the overall state in which the steel beam 120 is installed, Figure 6 shows a cross section of portion A-A of Figure 5, and Figure 7 shows Figure 5 It shows the floor plan of.

The degree of embedding of the end of the steel beam 120 is sufficient as long as the composite force with the edge beam 200 can be maintained and there is no need to specifically limit it. However, as shown in FIG. 6, a through hole 121a is formed in the web 121. By forming and allowing the horizontal reinforcement 132 for the edge beam 200 to pass through the through hole 121a, the horizontal reinforcement 132 functions as a shear reinforcement for the steel beam 120 to create a composite force between them. It is desirable to raise it.

Accordingly, unlike the prior art, there is no need to install hardware for joining the steel beam 120 to the border beam 200, and a separate task of measuring the length of the steel beam 120 to be installed to correct construction errors is required. There will be no need for it. Therefore, the installation and construction of the steel beam 120 becomes very simple, allowing the process to proceed smoothly.

In this way, the support structure of the form for constructing the border beam 200, which secures structural integrity by embedding the end of the steel beam 120, is similar to the prior art of installing a brace to install the border beam 200. In contrast, as shown in FIG. 6, a pedestal 111 is installed on the retaining wall 100 and thereby has a structure to support a load such as formwork for building the edge beam 200.

Specifically, the pedestal 111 exposes the steel frame 101 embedded in the retaining wall 100 and then fixes it by welding or the like so that the upper load is transmitted to the ground through the steel frame 101.

A plurality of yokes 112 made of square pipes are installed on the upper surface of this pedestal 111 in the longitudinal direction of the retaining wall 100, and a lower formwork 113 is installed on the upper surface. The bottom formwork 113 is made of lath or plywood.

When the installation of the bottom formwork 113 on the pedestal 111 is completed, the end of the steel beam 120 is mounted on the upper surface of the bottom formwork 113. The end of the steel beam 120 must be brought inward enough to be embedded in the inside of the border beam 200 to be built.

Next, the reinforcing bar assembly 130 for the border beam 200 is placed on the upper surface of the lower formwork 113. At this time, vertical reinforcing bars 131 for connection with the reinforcing bars of the outer wall may be installed in advance so that they protrude from the upper part of the edge beam 200. If necessary, as shown in FIG. 7, a vertical reinforcing bar 131 mounting groove 122a may be provided on the upper and lower flanges 122 of the steel beam 120. It is desirable to place a coupler 133 on the lower bottom formwork 113 where the vertical reinforcing bars 131 are installed so that joint reinforcing bars can be installed from the bottom in the future.

In addition, by inserting the horizontal reinforcing bar 132 into the through hole 121a formed in the web 121 of the steel beam 120, the horizontal reinforcing bar 132 performs an anchoring function to secure the border beam 200 and the steel beam 120. It has already been explained that the synthetic power between the two can be increased.

Once the mounting of the end of the steel beam 120 and the arrangement of the reinforcing bar assembly 130 are completed, the side formwork 114 is installed on the outside of the bottom formwork 113. Figures 8 and 9 show each embodiment of the structure for fixing the end of the side formwork 114.

The end of the side formwork 114 according to the first embodiment shown in FIG. 8 is fixed by a vertical stiffener 140 installed on the steel beam 120. The vertical stiffener 140 is symmetrically installed on the left and right sides of the web 121 at the outer surface position of the edge beam 200 of the steel beam 120 introduced into the area of the border beam 200. The vertical stiffener 140 reinforces the rapidly changing cross section and functions as a fixing means for the side formwork 114.

For this purpose, the vertical stiffener 140, unlike a typical stiffener, is provided with a joint 141 at the outer end. The side formwork 114 is installed by fixing both ends to the joint 141 using fixing means such as welding or bolting.

형상의 단부고정재(150)에 의한다. 상기의 단부고정재(150)는 웨브(121)의 단부면에 밀착되는 거치편(151)과, 상기 거치편(151)을 중심으로 양측으로 절곡되어 웨브(121)의 양면에 밀착되는 연결편(152) 및, 상기 연결편(152)에서 외측으로 각각 절곡되어 날개형상을 가지면서 측면거푸집(114)의 단부를 고정 지지하는 걸림편(153)으로 구성된다. 따라서 양측의 연결편(152) 사이에는 웨브(121)가 삽입될 수 있는 삽입공간(152b)이 형성된다.The fixation of the end of the side formwork 114 according to the second embodiment shown in Figure 9 is mounted and fixed to the web 121 of the end of the steel beam 120.

It depends on the shape of the end fixing material (150). The end fixer 150 includes a mounting piece 151 that is in close contact with the end surface of the web 121, and a connecting piece 152 that is bent on both sides around the mounting piece 151 and is in close contact with both sides of the web 121. ) and a locking piece 153 that is bent outward from the connecting piece 152 to have a wing shape and fixedly supports the end of the side mold 114. Accordingly, an insertion space 152b into which the web 121 can be inserted is formed between the connecting pieces 152 on both sides.

At this time, when the web 121 is provided with the above-described through hole 121a, the connecting piece 152 must be further provided with a through opening 152a to communicate with the through hole 121a.

When the end fixing material 150 is installed so that the end of the web 121 of the steel beam 120 is inserted into the insertion space 152b, the holding piece 151 is tightly fixed and caught by the end surface of the web 121. The locking piece 153 is maintained in its correct position so that the piece 153 is not pushed outward.

Even if the side formwork 114 is simply inserted into the locking piece 153 and no fixing work is performed using a separate fixing means as in the first embodiment, both ends of the side formwork 114 are attached to the end fixing material 150. Since it is fixed and supported by the locking pieces 153 on both sides, it is possible to have a stable installation structure of the side formwork 114, making construction much easier.

A support member 160 is installed on the outer surface of the side formwork 114, where both ends are fixed through one of the means of each of the above-described embodiments, to prevent saturation due to lateral pressure of the concrete. Figures 10 to 13 each show the support material 160. Figure 10 is an overall view to explain the configuration of the support material 160, and Figures 11 to 13 show the support material 160. Each embodiment in a fixedly installed state is shown in cross section.

The support member 160 may be of a structure that can be easily installed from the outside of the side formwork 114 without installing a form tie on the inside. In one embodiment of the present invention, as shown in FIG. 10, the side support material 160 An upper horizontal angle member 161 installed at the top of the formwork 114, a lower horizontal angle member 162 installed at the lower part of the side formwork 114 corresponding to the upper horizontal angle member 161, and these upper horizontal angle members ( It consists of a pressurized vertical angle member 163 installed between 161) and the lower horizontal angle member 162, and a polygonal support piece 164 that supports the pressurized vertical angle member 163.

The upper horizontal angle member 161 and the lower horizontal angle member 162 are installed in parallel in the horizontal direction at the upper and lower ends of the side formwork 114, and distribute the lateral pressure acting on the side formwork 114 throughout the side formwork 114. Prevent deformation from occurring in any specific area.

The pressurized vertical angle member 163 is installed vertically between the upper horizontal member 161 and the lower horizontal member 162, and the polygonal support piece 164 at the rear supports the concrete lateral pressure transmitted through the side formwork 114. To enable this, a plurality of them are installed at regular intervals on the left and right sides of the side formwork 114.

As described above, the polygonal support piece 164, which functions as a brace, is made up of a cross-section of the lower part of the lower part that is wider than the upper part to maintain structural stability. A fixing piece 164a may be further provided at the front end and bottom of the polygonal support member 164 for coupling with the pressurized vertical angle member 163 and the support pipe 170, which will be described later.

A support pipe 170 is installed on the upper surface of the seat 111 to fix and support the support member 160 configured as described above. The support pipe 170 is located on the same horizontal line as the yoke 112 installed in the lower part of the lower surface formwork 113 on the outside of the lower surface formwork 113, and fixes the polygonal support piece 164 to form the support member 160 between them. ) is not pushed backwards by the lateral pressure of the concrete.

The fixation of the polygonal support piece 164 to the support pipe 170 may be done by a fastening means such as a piece 165 as shown in FIG. 11, or as shown in FIG. 12 by using a polygonal support piece ( A step 164b is provided at the rear edge of 164, and the step 164b rests on the edge of the support pipe 170, so that the multi-angled support piece 164 is fixed to the support pipe 170. 13, the support pipe 170 is provided with fitting grooves 171 at regular intervals, and the corners of the polygonal support pieces 164 are inserted into the fitting grooves 171, thereby forming the polygonal support pieces 164. ) may be fixedly supported on the support pipe 170.

In the case of the embodiment shown in FIGS. 12 and 13 above, the support material is provided simply by placing the polygonal support piece 164 over the edge of the support pipe 170 or inserting it into the fitting groove 171 without performing a separate fastening operation. Since the installation work of (160) is completed, the work of installing the support structure of the side form (114) becomes very simple.

When all of the above-described formwork installation work is completed, concrete is poured as described above to build the edge beam 200 and the slab 300. When the concrete of the edge beam 200 and the slab 300 is cured and the support structure of the earth retaining wall 100 is completed, the pedestal 111 and each form used for this are removed and installed on the lower level of the car. is recycled in a way Figure 14 shows the state in which the construction of the edge beam 200 and the slab 300 is completed and the retaining wall 100 is supported.

When the construction of horizontal structures such as steel beams 120 and slabs 300 for the first floor above ground is completed and the support structure of the earth retaining wall 100 is established, the support structure of the form is dismantled through excavation work for the lower part. By repeating each step, the construction of the horizontal structure up to the lowest floor of the basement is completed, and after constructing the foundation floor, the external wall is poured in a sequential manner by joining the earth retaining wall (100) from the lowest floor to the first floor above ground to form a vertical structure. completes.

In the above, the present invention has been described in detail with reference to specific embodiments, but the embodiments are merely examples to make the present invention easier to understand, so those skilled in the art will understand the scope of the technical idea of the present invention. It is obvious that this can be implemented with various modifications. Accordingly, such modifications will be said to fall within the scope of the present invention as set forth in the claims.

100; earth retaining wall 101; steel frame
111; pedestal 112; yoke
113; Bottom mold 114; side formwork
120; steel beam 121; web
121a; pass-through hole 122; flange
122a; Holding groove 130; rebar assembly
131; vertical rebar 132; horizontal rebar
133; coupler 140; vertical stiffener
141; joint 150; End fixing material
151; Geohyeonpyeon 152; connection
152a; Passing opening 152b; insertion space
153; Hang piece 160; Saiji material
161; Upper horizontal angle member 162; Lower horizontal angle timber
163; pressurized vertical angle lumber 164; multi-faceted support
164a; Batten 165; peace
170; support pipe 171; Fitting groove
200; border beam 300; slab

Claims (8)

After constructing the retaining wall 100, a portion of the retaining wall 100 is exposed by excavating to maintain the angle of repose to construct a border beam 200 of a reinforced concrete structure on the retaining wall 100, and the border beam ( A slab 300 is constructed adjacent to 200, so that the back earth pressure of the retaining wall 100 is supported by the slab 300, and each of the above-described excavated soil, border beam 200, and slab 300 is constructed. As a reverse drilling method for constructing an underground building by repeating steps, the end of the steel beam 120 supporting the load of the slab 300 is embedded in the border beam 200,
In the construction of the border beam 200 and the slab 300, the pedestal 111 is installed on the retaining wall 100, and the yoke 112 and the lower formwork 113 are sequentially installed on the upper surface of the pedestal 111. , the end of the steel beam 120 is mounted on the lower formwork 113 so that it is introduced into the inside of the border beam 200 to be built, and the reinforcing bar assembly 130 for the border beam 200 is disposed, and the upper surface of the seat 111 A support pipe 170 is installed on the outside of the lower mold 113, and a support material 160 for preventing fullness is installed on the side mold 114, and the support pipe 160 is the support pipe 170. This is done by pouring concrete while it is fixed and supported by,
The support member 160 includes an upper horizontal angle member 161 installed in the horizontal direction on the upper part of the side formwork 114, and a horizontal direction at the lower part of the side formwork 114 corresponding to the upper horizontal angle member 161. A lower horizontal angle member 162 installed as a lower horizontal angle member 162, a pressurized vertical angle member 163 installed between the upper and lower horizontal angle members 161 and 162 to press the side formwork 114, and a lower bracket supporting the pressurized vertical angle member 163. It is composed of a polygonal support piece 164 in a narrow sense, and a rear edge of the polygonal support piece 164 is provided with a step 164b, so that the step 164b spans the edge of the support pipe 170 to support the polygonal support. A steel beam reverse drilling method using a steel beam end embedded border beam, characterized in that the piece (164) is fixedly supported. delete According to paragraph 1,
A pair of left and right vertical stiffeners 140 are installed at the outer surface of the border beam 200 of the steel beam 120, and a joint 141 is provided at the outer end of the vertical stiffener 140,
A steel beam reverse drilling method using a steel beam end embedded border beam, characterized in that both ends of the side formwork 114 are fixed and supported by the joint piece 141. According to paragraph 1,
The end of the web 121 of the steel beam 120 is composed of a holding piece 151, a connecting piece 152, and a catching piece 153.

A shaped end fixture 150 is installed,
A steel beam reverse drilling method using a steel beam end embedded border beam, characterized in that both ends of the side formwork (114) are fixed and supported by both side locking pieces (153) of the end fixing material (150). delete delete delete According to paragraph 1,
The support pipe 170 is provided with fitting grooves 171 at regular intervals,
A steel beam reverse drilling method using a steel beam end embedded border beam, characterized in that the edge of the polygonal support piece 164 is inserted into the fitting groove 171 and fixedly supported.

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